31106399 has 2 divisors, whose sum is σ = 31106400. Its totient is φ = 31106398.

The previous prime is 31106377. The next prime is 31106417. The reversal of 31106399 is 99360113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31106399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31106099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15553199 + 15553200.

It is an arithmetic number, because the mean of its divisors is an integer number (15553200).

Almost surely, 2^31106399 is an apocalyptic number.

31106399 is a deficient number, since it is larger than the sum of its proper divisors (1).

31106399 is an equidigital number, since it uses as much as digits as its factorization.

31106399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31106399 is about 5577.3110904808. The cubic root of 31106399 is about 314.4970524349.

The spelling of 31106399 in words is "thirty-one million, one hundred six thousand, three hundred ninety-nine".