31031013402 has 36 divisors (see below), whose sum is σ = 68095943370. Its totient is φ = 10212701616.

The previous prime is 31031013401. The next prime is 31031013469. The reversal of 31031013402 is 20431013013.

31031013402 is a `hidden beast` number, since 3 + 10 + 310 + 1 + 340 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22791638961 + 8239374441 = 150969^2 + 90771^2 .

It is a super-2 number, since 2×31031013402² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31031013401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25777 + ... + 250452.

Almost surely, 2^31031013402 is an apocalyptic number.

31031013402 is an abundant number, since it is smaller than the sum of its proper divisors (37064929968).

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

31031013402 is a wasteful number, since it uses less digits than its factorization.

31031013402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276395 (or 276313 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31031013402 its reverse (20431013013), we get a palindrome (51462026415).

The spelling of 31031013402 in words is "thirty-one billion, thirty-one million, thirteen thousand, four hundred two".