31311442420078 has 4 divisors (see below), whose sum is σ = 46967163630120. Its totient is φ = 15655721210038.

The previous prime is 31311442420019. The next prime is 31311442420079. The reversal of 31311442420078 is 87002424411313.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31311442420078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311442420079) 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 as a sum of consecutive naturals, namely, 7827860605018 + ... + 7827860605021.

It is an arithmetic number, because the mean of its divisors is an integer number (11741790907530).

Almost surely, 2^{31311442420078} is an apocalyptic number.

31311442420078 is a deficient number, since it is larger than the sum of its proper divisors (15655721210042).

31311442420078 is a wasteful number, since it uses less digits than its factorization.

31311442420078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15655721210041.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 31311442420078 in words is "thirty-one trillion, three hundred eleven billion, four hundred forty-two million, four hundred twenty thousand, seventy-eight".