79442501 has 2 divisors, whose sum is σ = 79442502. Its totient is φ = 79442500.

The previous prime is 79442443. The next prime is 79442507. The reversal of 79442501 is 10524497.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 5997601 = 8570^2 + 2449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79442501 is a prime.

It is a super-2 number, since 2×79442501² = 12622221930270002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79442507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39721250 + 39721251.

It is an arithmetic number, because the mean of its divisors is an integer number (39721251).

Almost surely, 2^79442501 is an apocalyptic number.

It is an amenable number.

79442501 is a deficient number, since it is larger than the sum of its proper divisors (1).

79442501 is an equidigital number, since it uses as much as digits as its factorization.

79442501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 79442501 is about 8913.0522830285. The cubic root of 79442501 is about 429.8836912760.

Adding to 79442501 its reverse (10524497), we get a palindrome (89966998).

The spelling of 79442501 in words is "seventy-nine million, four hundred forty-two thousand, five hundred one".