31142807 has 2 divisors, whose sum is σ = 31142808. Its totient is φ = 31142806.

The previous prime is 31142803. The next prime is 31142831. The reversal of 31142807 is 70824113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31142807 - 2² = 31142803 is a prime.

It is a Chen prime.

It is equal to p_1924217 and since 31142807 and 1924217 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571403 + 15571404.

It is an arithmetic number, because the mean of its divisors is an integer number (15571404).

Almost surely, 2^31142807 is an apocalyptic number.

31142807 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142807 is an equidigital number, since it uses as much as digits as its factorization.

31142807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 31142807 is about 5580.5740744121. The cubic root of 31142807 is about 314.6197039870.

The spelling of 31142807 in words is "thirty-one million, one hundred forty-two thousand, eight hundred seven".