31149623 has 2 divisors, whose sum is σ = 31149624. Its totient is φ = 31149622.

The previous prime is 31149619. The next prime is 31149641. The reversal of 31149623 is 32694113.

It is a weak prime.

It is an emirp because it is prime and its reverse (32694113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31149623 - 2² = 31149619 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31149023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15574811 + 15574812.

It is an arithmetic number, because the mean of its divisors is an integer number (15574812).

Almost surely, 2^31149623 is an apocalyptic number.

31149623 is a deficient number, since it is larger than the sum of its proper divisors (1).

31149623 is an equidigital number, since it uses as much as digits as its factorization.

31149623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 31149623 is about 5581.1847308614. The cubic root of 31149623 is about 314.6426551559.

The spelling of 31149623 in words is "thirty-one million, one hundred forty-nine thousand, six hundred twenty-three".