31152040243561 has 8 divisors (see below), whose sum is σ = 31971413444544. Its totient is φ = 30343239600240.

The previous prime is 31152040243553. The next prime is 31152040243579. The reversal of 31152040243561 is 16534204025113.

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

It is a cyclic number.

It is not a de Polignac number, because 31152040243561 - 2³ = 31152040243553 is a prime.

It is a super-2 number, since 2×31152040243561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31152040243561.

It is not an unprimeable number, because it can be changed into a prime (31152040243591) 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, 2643133446 + ... + 2643145231.

It is an arithmetic number, because the mean of its divisors is an integer number (3996426680568).

Almost surely, 2^{31152040243561} is an apocalyptic number.

It is an amenable number.

31152040243561 is a deficient number, since it is larger than the sum of its proper divisors (819373200983).

31152040243561 is an equidigital number, since it uses as much as digits as its factorization.

31152040243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286278831.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 31152040243561 its reverse (16534204025113), we get a palindrome (47686244268674).

The spelling of 31152040243561 in words is "thirty-one trillion, one hundred fifty-two billion, forty million, two hundred forty-three thousand, five hundred sixty-one".