90979381 has 2 divisors, whose sum is σ = 90979382. Its totient is φ = 90979380.

The previous prime is 90979349. The next prime is 90979387. The reversal of 90979381 is 18397909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71132356 + 19847025 = 8434^2 + 4455^2 .

It is a cyclic number.

It is not a de Polignac number, because 90979381 - 2⁵ = 90979349 is a prime.

It is a super-2 number, since 2×90979381² = 16554495534286322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90979387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45489690 + 45489691.

It is an arithmetic number, because the mean of its divisors is an integer number (45489691).

Almost surely, 2^90979381 is an apocalyptic number.

It is an amenable number.

90979381 is a deficient number, since it is larger than the sum of its proper divisors (1).

90979381 is an equidigital number, since it uses as much as digits as its factorization.

90979381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 90979381 is about 9538.3112236915. The cubic root of 90979381 is about 449.7601701465.

The spelling of 90979381 in words is "ninety million, nine hundred seventy-nine thousand, three hundred eighty-one".