140404561 has 4 divisors (see below), whose sum is σ = 153168624. Its totient is φ = 127640500.

The previous prime is 140404501. The next prime is 140404577. The reversal of 140404561 is 165404041.

140404561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 140404561 - 2¹³ = 140396369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140404501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6382015 + ... + 6382036.

It is an arithmetic number, because the mean of its divisors is an integer number (38292156).

Almost surely, 2^140404561 is an apocalyptic number.

140404561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140404561 is a deficient number, since it is larger than the sum of its proper divisors (12764063).

140404561 is a wasteful number, since it uses less digits than its factorization.

140404561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12764062.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 140404561 is about 11849.2430559931. The cubic root of 140404561 is about 519.7490912299.

The spelling of 140404561 in words is "one hundred forty million, four hundred four thousand, five hundred sixty-one".