5661315731 has 8 divisors (see below), whose sum is σ = 5720395824. Its totient is φ = 5602295200.

The previous prime is 5661315713. The next prime is 5661315739. The reversal of 5661315731 is 1375131665.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661315731 is a prime.

It is a super-2 number, since 2×5661315731² = 64100991612136128722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661315739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190901 + ... + 218553.

It is an arithmetic number, because the mean of its divisors is an integer number (715049478).

Almost surely, 2^5661315731 is an apocalyptic number.

5661315731 is a deficient number, since it is larger than the sum of its proper divisors (59080093).

5661315731 is a wasteful number, since it uses less digits than its factorization.

5661315731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29781.

The product of its digits is 56700, while the sum is 38.

The square root of 5661315731 is about 75241.7153645503. The cubic root of 5661315731 is about 1782.2657393930.

The spelling of 5661315731 in words is "five billion, six hundred sixty-one million, three hundred fifteen thousand, seven hundred thirty-one".