561377431 has 16 divisors (see below), whose sum is σ = 589646304. Its totient is φ = 533879424.

The previous prime is 561377407. The next prime is 561377441. The reversal of 561377431 is 134773165.

It is a cyclic number.

It is not a de Polignac number, because 561377431 - 2⁷ = 561377303 is a prime.

It is a super-2 number, since 2×561377431² = 630289240072319522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561377441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915481 + ... + 916093.

It is an arithmetic number, because the mean of its divisors is an integer number (36852894).

Almost surely, 2^561377431 is an apocalyptic number.

561377431 is a deficient number, since it is larger than the sum of its proper divisors (28268873).

561377431 is a wasteful number, since it uses less digits than its factorization.

561377431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 52920, while the sum is 37.

The square root of 561377431 is about 23693.4047996484. The cubic root of 561377431 is about 824.9323144960.

The spelling of 561377431 in words is "five hundred sixty-one million, three hundred seventy-seven thousand, four hundred thirty-one".