31411979 has 2 divisors, whose sum is σ = 31411980. Its totient is φ = 31411978.

The previous prime is 31411969. The next prime is 31411981. The reversal of 31411979 is 97911413.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97911413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31411979 is a prime.

Together with 31411981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31411969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15705989 + 15705990.

It is an arithmetic number, because the mean of its divisors is an integer number (15705990).

Almost surely, 2^31411979 is an apocalyptic number.

31411979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31411979 is an equidigital number, since it uses as much as digits as its factorization.

31411979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 31411979 is about 5604.6390606354. The cubic root of 31411979 is about 315.5235402278.

The spelling of 31411979 in words is "thirty-one million, four hundred eleven thousand, nine hundred seventy-nine".