79969997 has 2 divisors, whose sum is σ = 79969998. Its totient is φ = 79969996.

The previous prime is 79969979. The next prime is 79970029. The reversal of 79969997 is 79996997.

Together with previous prime (79969979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79103236 + 866761 = 8894^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 79969997 - 2¹⁴ = 79953613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79969297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39984998 + 39984999.

It is an arithmetic number, because the mean of its divisors is an integer number (39984999).

Almost surely, 2^79969997 is an apocalyptic number.

It is an amenable number.

79969997 is a deficient number, since it is larger than the sum of its proper divisors (1).

79969997 is an equidigital number, since it uses as much as digits as its factorization.

79969997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17360406, while the sum is 65.

The square root of 79969997 is about 8942.5945340265. The cubic root of 79969997 is about 430.8330650177.

Subtracting 79969997 from its reverse (79996997), we obtain a cube (27000 = 30³).

The spelling of 79969997 in words is "seventy-nine million, nine hundred sixty-nine thousand, nine hundred ninety-seven".