31142517 has 16 divisors (see below), whose sum is σ = 48125952. Its totient is φ = 17544240.

The previous prime is 31142497. The next prime is 31142537. The reversal of 31142517 is 71524113.

It is an interprime number because it is at equal distance from previous prime (31142497) and next prime (31142537).

It is not a de Polignac number, because 31142517 - 2⁷ = 31142389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31142537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8953 + ... + 11934.

It is an arithmetic number, because the mean of its divisors is an integer number (3007872).

Almost surely, 2^31142517 is an apocalyptic number.

It is an amenable number.

31142517 is a deficient number, since it is larger than the sum of its proper divisors (16983435).

31142517 is a wasteful number, since it uses less digits than its factorization.

31142517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20968.

The product of its digits is 840, while the sum is 24.

The square root of 31142517 is about 5580.5480913616. The cubic root of 31142517 is about 314.6187274105.

The spelling of 31142517 in words is "thirty-one million, one hundred forty-two thousand, five hundred seventeen".