31379261 has 2 divisors, whose sum is σ = 31379262. Its totient is φ = 31379260.

The previous prime is 31379239. The next prime is 31379273. The reversal of 31379261 is 16297313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 14822500 = 4069^2 + 3850^2 .

It is an emirp because it is prime and its reverse (16297313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31379261 is a prime.

It is a super-2 number, since 2×31379261² = 1969316041812242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31379861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689630 + 15689631.

It is an arithmetic number, because the mean of its divisors is an integer number (15689631).

Almost surely, 2^31379261 is an apocalyptic number.

It is an amenable number.

31379261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31379261 is an equidigital number, since it uses as much as digits as its factorization.

31379261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 31379261 is about 5601.7194681633. The cubic root of 31379261 is about 315.4139548004.

The spelling of 31379261 in words is "thirty-one million, three hundred seventy-nine thousand, two hundred sixty-one".