7972542491 has 2 divisors, whose sum is σ = 7972542492. Its totient is φ = 7972542490.

The previous prime is 7972542469. The next prime is 7972542563. The reversal of 7972542491 is 1942452797.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7972542491 - 2²² = 7968348187 is a prime.

It is a super-2 number, since 2×7972542491² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (7972542421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986271245 + 3986271246.

It is an arithmetic number, because the mean of its divisors is an integer number (3986271246).

Almost surely, 2^7972542491 is an apocalyptic number.

7972542491 is a deficient number, since it is larger than the sum of its proper divisors (1).

7972542491 is an equidigital number, since it uses as much as digits as its factorization.

7972542491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 7972542491 is about 89289.0950284524. The cubic root of 7972542491 is about 1997.7092514874.

The spelling of 7972542491 in words is "seven billion, nine hundred seventy-two million, five hundred forty-two thousand, four hundred ninety-one".