31541111640225 has 72 divisors (see below), whose sum is σ = 61651626802272. Its totient is φ = 15287149958400.

The previous prime is 31541111640223. The next prime is 31541111640307. The reversal of 31541111640225 is 52204611114513.

31541111640225 is a `hidden beast` number, since 3 + 1 + 5 + 4 + 1 + 1 + 1 + 1 + 640 + 2 + 2 + 5 = 666.

It is not a de Polignac number, because 31541111640225 - 2¹ = 31541111640223 is a prime.

It is a super-2 number, since 2×31541111640225² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31541111640225.

It is not an unprimeable number, because it can be changed into a prime (31541111640223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4578534 + ... + 9167616.

It is an arithmetic number, because the mean of its divisors is an integer number (856272594476).

Almost surely, 2^{31541111640225} is an apocalyptic number.

It is an amenable number.

31541111640225 is a deficient number, since it is larger than the sum of its proper divisors (30110515162047).

31541111640225 is a wasteful number, since it uses less digits than its factorization.

31541111640225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591887 (or 4591879 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 31541111640225 its reverse (52204611114513), we get a palindrome (83745722754738).

The spelling of 31541111640225 in words is "thirty-one trillion, five hundred forty-one billion, one hundred eleven million, six hundred forty thousand, two hundred twenty-five".