31121453402 has 64 divisors (see below), whose sum is σ = 51967319040. Its totient is φ = 13888992000.

The previous prime is 31121453371. The next prime is 31121453417. The reversal of 31121453402 is 20435412113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43283999 + ... + 43284717.

It is an arithmetic number, because the mean of its divisors is an integer number (811989360).

Almost surely, 2^31121453402 is an apocalyptic number.

31121453402 is a deficient number, since it is larger than the sum of its proper divisors (20845865638).

31121453402 is a wasteful number, since it uses less digits than its factorization.

31121453402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 31121453402 its reverse (20435412113), we get a palindrome (51556865515).

The spelling of 31121453402 in words is "thirty-one billion, one hundred twenty-one million, four hundred fifty-three thousand, four hundred two".