31038108619861 has 16 divisors (see below), whose sum is σ = 36053709273088. Its totient is φ = 26171325342000.

The previous prime is 31038108619823. The next prime is 31038108619939. The reversal of 31038108619861 is 16891680183013.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31038108619861 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 (31038108619961) 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 15 ways as a sum of consecutive naturals, for example, 142436475 + ... + 142654216.

It is an arithmetic number, because the mean of its divisors is an integer number (2253356829568).

Almost surely, 2^{31038108619861} is an apocalyptic number.

It is an amenable number.

31038108619861 is a deficient number, since it is larger than the sum of its proper divisors (5015600653227).

31038108619861 is a wasteful number, since it uses less digits than its factorization.

31038108619861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285090952.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 31038108619861 in words is "thirty-one trillion, thirty-eight billion, one hundred eight million, six hundred nineteen thousand, eight hundred sixty-one".