31357097 has 2 divisors, whose sum is σ = 31357098. Its totient is φ = 31357096.

The previous prime is 31357069. The next prime is 31357121. The reversal of 31357097 is 79075313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30349081 + 1008016 = 5509^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 31357097 - 2¹⁴ = 31340713 is a prime.

It is not a weakly prime, because it can be changed into another prime (31357297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15678548 + 15678549.

It is an arithmetic number, because the mean of its divisors is an integer number (15678549).

Almost surely, 2^31357097 is an apocalyptic number.

It is an amenable number.

31357097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31357097 is an equidigital number, since it uses as much as digits as its factorization.

31357097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 31357097 is about 5599.7407975727. The cubic root of 31357097 is about 315.3396755763.

The spelling of 31357097 in words is "thirty-one million, three hundred fifty-seven thousand, ninety-seven".