7972551989 has 2 divisors, whose sum is σ = 7972551990. Its totient is φ = 7972551988.

The previous prime is 7972551973. The next prime is 7972551991. The reversal of 7972551989 is 9891552797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7581184900 + 391367089 = 87070^2 + 19783^2 .

It is a cyclic number.

It is not a de Polignac number, because 7972551989 - 2⁴ = 7972551973 is a prime.

It is a super-2 number, since 2×7972551989² (a number of 21 digits) contains 22 as substring.

Together with 7972551991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7972551919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986275994 + 3986275995.

It is an arithmetic number, because the mean of its divisors is an integer number (3986275995).

Almost surely, 2^7972551989 is an apocalyptic number.

It is an amenable number.

7972551989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7972551989 is an equidigital number, since it uses as much as digits as its factorization.

7972551989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14288400, while the sum is 62.

The square root of 7972551989 is about 89289.1482152227. The cubic root of 7972551989 is about 1997.7100448033.

The spelling of 7972551989 in words is "seven billion, nine hundred seventy-two million, five hundred fifty-one thousand, nine hundred eighty-nine".