79428991 has 2 divisors, whose sum is σ = 79428992. Its totient is φ = 79428990.

The previous prime is 79428953. The next prime is 79428997. The reversal of 79428991 is 19982497.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79428991 - 2⁷ = 79428863 is a prime.

It is a super-2 number, since 2×79428991² = 12617929222556162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79428997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39714495 + 39714496.

It is an arithmetic number, because the mean of its divisors is an integer number (39714496).

Almost surely, 2^79428991 is an apocalyptic number.

79428991 is a deficient number, since it is larger than the sum of its proper divisors (1).

79428991 is an equidigital number, since it uses as much as digits as its factorization.

79428991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 79428991 is about 8912.2943735045. The cubic root of 79428991 is about 429.8593212061.

The spelling of 79428991 in words is "seventy-nine million, four hundred twenty-eight thousand, nine hundred ninety-one".