140744581 has 4 divisors (see below), whose sum is σ = 149023692. Its totient is φ = 132465472.

The previous prime is 140744579. The next prime is 140744599. The reversal of 140744581 is 185447041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128459556 + 12285025 = 11334^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 140744581 - 2¹ = 140744579 is a prime.

It is a super-2 number, since 2×140744581² = 39618074161731122, 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 (140744561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139530 + ... + 4139563.

It is an arithmetic number, because the mean of its divisors is an integer number (37255923).

Almost surely, 2^140744581 is an apocalyptic number.

It is an amenable number.

140744581 is a deficient number, since it is larger than the sum of its proper divisors (8279111).

140744581 is an equidigital number, since it uses as much as digits as its factorization.

140744581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8279110.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 140744581 is about 11863.5821318858. The cubic root of 140744581 is about 520.1683145966.

The spelling of 140744581 in words is "one hundred forty million, seven hundred forty-four thousand, five hundred eighty-one".