31381061145 has 64 divisors (see below), whose sum is σ = 59371192320. Its totient is φ = 13850611200.

The previous prime is 31381061137. The next prime is 31381061161. The reversal of 31381061145 is 54116018313.

It is not a de Polignac number, because 31381061145 - 2³ = 31381061137 is a prime.

It is a super-2 number, since 2×31381061145² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1417965 + ... + 1439925.

It is an arithmetic number, because the mean of its divisors is an integer number (927674880).

Almost surely, 2^31381061145 is an apocalyptic number.

31381061145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31381061145 is a deficient number, since it is larger than the sum of its proper divisors (27990131175).

31381061145 is a wasteful number, since it uses less digits than its factorization.

31381061145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446.

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 31381061145 its reverse (54116018313), we get a palindrome (85497079458).

The spelling of 31381061145 in words is "thirty-one billion, three hundred eighty-one million, sixty-one thousand, one hundred forty-five".