31429897 has 2 divisors, whose sum is σ = 31429898. Its totient is φ = 31429896.

The previous prime is 31429873. The next prime is 31429907. The reversal of 31429897 is 79892413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28526281 + 2903616 = 5341^2 + 1704^2 .

It is an emirp because it is prime and its reverse (79892413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31429897 - 2¹⁵ = 31397129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31429807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15714948 + 15714949.

It is an arithmetic number, because the mean of its divisors is an integer number (15714949).

Almost surely, 2^31429897 is an apocalyptic number.

It is an amenable number.

31429897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31429897 is an equidigital number, since it uses as much as digits as its factorization.

31429897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 31429897 is about 5606.2373299745. The cubic root of 31429897 is about 315.5835223997.

The spelling of 31429897 in words is "thirty-one million, four hundred twenty-nine thousand, eight hundred ninety-seven".