31540099 has 2 divisors, whose sum is σ = 31540100. Its totient is φ = 31540098.

The previous prime is 31540063. The next prime is 31540109. The reversal of 31540099 is 99004513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31540099 - 2⁷ = 31539971 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31540099.

It is not a weakly prime, because it can be changed into another prime (31540009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770049 + 15770050.

It is an arithmetic number, because the mean of its divisors is an integer number (15770050).

Almost surely, 2^31540099 is an apocalyptic number.

31540099 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540099 is an equidigital number, since it uses as much as digits as its factorization.

31540099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 31540099 is about 5616.0572468592. The cubic root of 31540099 is about 315.9519334838.

The spelling of 31540099 in words is "thirty-one million, five hundred forty thousand, ninety-nine".