31406897 has 2 divisors, whose sum is σ = 31406898. Its totient is φ = 31406896.

The previous prime is 31406873. The next prime is 31406909. The reversal of 31406897 is 79860413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21864976 + 9541921 = 4676^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 31406897 - 2¹⁶ = 31341361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31406897.

It is not a weakly prime, because it can be changed into another prime (31406807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15703448 + 15703449.

It is an arithmetic number, because the mean of its divisors is an integer number (15703449).

Almost surely, 2^31406897 is an apocalyptic number.

It is an amenable number.

31406897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31406897 is an equidigital number, since it uses as much as digits as its factorization.

31406897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 31406897 is about 5604.1856678736. The cubic root of 31406897 is about 315.5065236080.

The spelling of 31406897 in words is "thirty-one million, four hundred six thousand, eight hundred ninety-seven".