31240340120155 has 4 divisors (see below), whose sum is σ = 37488408144192. Its totient is φ = 24992272096120.

The previous prime is 31240340120063. The next prime is 31240340120159. The reversal of 31240340120155 is 55102104304213.

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

It is not a de Polignac number, because 31240340120155 - 2³⁹ = 30690584306267 is a prime.

It is a super-2 number, since 2×31240340120155² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240340120159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124034012011 + ... + 3124034012020.

It is an arithmetic number, because the mean of its divisors is an integer number (9372102036048).

Almost surely, 2^{31240340120155} is an apocalyptic number.

31240340120155 is a deficient number, since it is larger than the sum of its proper divisors (6248068024037).

31240340120155 is an equidigital number, since it uses as much as digits as its factorization.

31240340120155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248068024036.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 31240340120155 its reverse (55102104304213), we get a palindrome (86342444424368).

The spelling of 31240340120155 in words is "thirty-one trillion, two hundred forty billion, three hundred forty million, one hundred twenty thousand, one hundred fifty-five".