79975901 has 2 divisors, whose sum is σ = 79975902. Its totient is φ = 79975900.

The previous prime is 79975873. The next prime is 79975949. The reversal of 79975901 is 10957997.

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., 67732900 + 12243001 = 8230^2 + 3499^2 .

It is a cyclic number.

It is not a de Polignac number, because 79975901 - 2¹⁰ = 79974877 is a prime.

It is a super-2 number, since 2×79975901² = 12792289481523602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79975001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39987950 + 39987951.

It is an arithmetic number, because the mean of its divisors is an integer number (39987951).

Almost surely, 2^79975901 is an apocalyptic number.

It is an amenable number.

79975901 is a deficient number, since it is larger than the sum of its proper divisors (1).

79975901 is an equidigital number, since it uses as much as digits as its factorization.

79975901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 79975901 is about 8942.9246334742. The cubic root of 79975901 is about 430.8436672265.

The spelling of 79975901 in words is "seventy-nine million, nine hundred seventy-five thousand, nine hundred one".