79951481 has 2 divisors, whose sum is σ = 79951482. Its totient is φ = 79951480.

The previous prime is 79951471. The next prime is 79951483. The reversal of 79951481 is 18415997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79941481 + 10000 = 8941^2 + 100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79951481 is a prime.

It is a super-2 number, since 2×79951481² = 12784478628186722, which contains 22 as substring.

Together with 79951483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79951483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39975740 + 39975741.

It is an arithmetic number, because the mean of its divisors is an integer number (39975741).

Almost surely, 2^79951481 is an apocalyptic number.

It is an amenable number.

79951481 is a deficient number, since it is larger than the sum of its proper divisors (1).

79951481 is an equidigital number, since it uses as much as digits as its factorization.

79951481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 79951481 is about 8941.5592040762. The cubic root of 79951481 is about 430.7998112096.

The spelling of 79951481 in words is "seventy-nine million, nine hundred fifty-one thousand, four hundred eighty-one".