31240023145 has 16 divisors (see below), whose sum is σ = 37590059520. Its totient is φ = 24924067200.

The previous prime is 31240023137. The next prime is 31240023211. The reversal of 31240023145 is 54132004213.

It is not a de Polignac number, because 31240023145 - 2³ = 31240023137 is a prime.

It is a super-2 number, since 2×31240023145² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5100685 + ... + 5106805.

It is an arithmetic number, because the mean of its divisors is an integer number (2349378720).

Almost surely, 2^31240023145 is an apocalyptic number.

It is an amenable number.

31240023145 is a deficient number, since it is larger than the sum of its proper divisors (6350036375).

31240023145 is a wasteful number, since it uses less digits than its factorization.

31240023145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31240023145 its reverse (54132004213), we get a palindrome (85372027358).

The spelling of 31240023145 in words is "thirty-one billion, two hundred forty million, twenty-three thousand, one hundred forty-five".