31261402120 has 64 divisors (see below), whose sum is σ = 77796094320. Its totient is φ = 11230700544.

The previous prime is 31261402087. The next prime is 31261402121. The reversal of 31261402120 is 2120416213.

It can be written as a sum of positive squares in 8 ways, for example, as 5147488516 + 26113913604 = 71746^2 + 161598^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31261402091 and 31261402100.

It is not an unprimeable number, because it can be changed into a prime (31261402121) 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, 793167 + ... + 831646.

Almost surely, 2^31261402120 is an apocalyptic number.

It is an amenable number.

31261402120 is an abundant number, since it is smaller than the sum of its proper divisors (46534692200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31261402120 is a wasteful number, since it uses less digits than its factorization.

31261402120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624874 (or 1624870 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31261402120 its reverse (2120416213), we get a palindrome (33381818333).

The spelling of 31261402120 in words is "thirty-one billion, two hundred sixty-one million, four hundred two thousand, one hundred twenty".