31220911212625 has 8 divisors (see below), whose sum is σ = 38963697193512. Its totient is φ = 24976728970000.

The previous prime is 31220911212613. The next prime is 31220911212637. The reversal of 31220911212625 is 52621211902213.

It is an interprime number because it is at equal distance from previous prime (31220911212613) and next prime (31220911212637).

It can be written as a sum of positive squares in 4 ways, for example, as 113341975569 + 31107569237056 = 336663^2 + 5577416^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31220911212625 is a prime.

It is a super-2 number, since 2×31220911212625² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124883644726 + ... + 124883644975.

It is an arithmetic number, because the mean of its divisors is an integer number (4870462149189).

Almost surely, 2^{31220911212625} is an apocalyptic number.

It is an amenable number.

31220911212625 is a deficient number, since it is larger than the sum of its proper divisors (7742785980887).

31220911212625 is an equidigital number, since it uses as much as digits as its factorization.

31220911212625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249767289716 (or 249767289706 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 31220911212625 in words is "thirty-one trillion, two hundred twenty billion, nine hundred eleven million, two hundred twelve thousand, six hundred twenty-five".