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140520901 = 160787443

140520901 has 4 divisors (see below), whose sum is σ = 140609952. Its totient is φ = 140431852.

The previous prime is 140520889. The next prime is 140520911. The reversal of 140520901 is 109025041.

Adding to 140520901 its reverse (109025041), we get a palindrome (249545942).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 109025041 = 187158271.

It is a cyclic number.

It is not a de Polignac number, because 140520901 - 29 = 140520389 is a prime.

It is a super-2 number, since 2×1405209012 = 39492247235703602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140520911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42115 + ... + 45328.

It is an arithmetic number, because the mean of its divisors is an integer number (35152488).

It is a 1578-hyperperfect number.

Almost surely, 2140520901 is an apocalyptic number.

It is an amenable number.

140520901 is a deficient number, since it is larger than the sum of its proper divisors (89051).

140520901 is an equidigital number, since it uses as much as digits as its factorization.

140520901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89050.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 140520901 is about 11854.1512138154. The cubic root of 140520901 is about 519.8926072602.

The spelling of 140520901 in words is "one hundred forty million, five hundred twenty thousand, nine hundred one".

Divisors: 1 1607 87443 140520901