31130023402 has 4 divisors (see below), whose sum is σ = 46695035106. Its totient is φ = 15565011700.

The previous prime is 31130023373. The next prime is 31130023423. The reversal of 31130023402 is 20432003113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20432003113 = 14011 ⋅1458283.

It can be written as a sum of positive squares in only one way, i.e., 30209568481 + 920454921 = 173809^2 + 30339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31130023402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782505849 + ... + 7782505852.

Almost surely, 2^31130023402 is an apocalyptic number.

31130023402 is a deficient number, since it is larger than the sum of its proper divisors (15565011704).

31130023402 is a wasteful number, since it uses less digits than its factorization.

31130023402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15565011703.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31130023402 its reverse (20432003113), we get a palindrome (51562026515).

The spelling of 31130023402 in words is "thirty-one billion, one hundred thirty million, twenty-three thousand, four hundred two".