31125998512949 has 4 divisors (see below), whose sum is σ = 32956939601964. Its totient is φ = 29295057423936.

The previous prime is 31125998512943. The next prime is 31125998512951. The reversal of 31125998512949 is 94921589952113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12331545256900 + 18794453256049 = 3511630^2 + 4335257^2 .

It is a cyclic number.

It is not a de Polignac number, because 31125998512949 - 2¹² = 31125998508853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125998512943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 915470544482 + ... + 915470544515.

It is an arithmetic number, because the mean of its divisors is an integer number (8239234900491).

Almost surely, 2^{31125998512949} is an apocalyptic number.

It is an amenable number.

31125998512949 is a deficient number, since it is larger than the sum of its proper divisors (1830941089015).

31125998512949 is a wasteful number, since it uses less digits than its factorization.

31125998512949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830941089014.

The product of its digits is 62985600, while the sum is 68.

The spelling of 31125998512949 in words is "thirty-one trillion, one hundred twenty-five billion, nine hundred ninety-eight million, five hundred twelve thousand, nine hundred forty-nine".