31542197 has 2 divisors, whose sum is σ = 31542198. Its totient is φ = 31542196.

The previous prime is 31542163. The next prime is 31542229. The reversal of 31542197 is 79124513.

It is an a-pointer prime, because the next prime (31542229) can be obtained adding 31542197 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30019441 + 1522756 = 5479^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 31542197 - 2¹⁰ = 31541173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771098 + 15771099.

It is an arithmetic number, because the mean of its divisors is an integer number (15771099).

Almost surely, 2^31542197 is an apocalyptic number.

It is an amenable number.

31542197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542197 is an equidigital number, since it uses as much as digits as its factorization.

31542197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 31542197 is about 5616.2440295984. The cubic root of 31542197 is about 315.9589388777.

The spelling of 31542197 in words is "thirty-one million, five hundred forty-two thousand, one hundred ninety-seven".