31140929 has 2 divisors, whose sum is σ = 31140930. Its totient is φ = 31140928.

The previous prime is 31140911. The next prime is 31140979. The reversal of 31140929 is 92904113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 8862529 = 4720^2 + 2977^2 .

It is an emirp because it is prime and its reverse (92904113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31140929 - 2⁸ = 31140673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31140979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570464 + 15570465.

It is an arithmetic number, because the mean of its divisors is an integer number (15570465).

Almost surely, 2^31140929 is an apocalyptic number.

It is an amenable number.

31140929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140929 is an equidigital number, since it uses as much as digits as its factorization.

31140929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 31140929 is about 5580.4058096164. The cubic root of 31140929 is about 314.6133797050.

The spelling of 31140929 in words is "thirty-one million, one hundred forty thousand, nine hundred twenty-nine".