7942157969 has 2 divisors, whose sum is σ = 7942157970. Its totient is φ = 7942157968.

The previous prime is 7942157963. The next prime is 7942157981. The reversal of 7942157969 is 9697512497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7936493569 + 5664400 = 89087^2 + 2380^2 .

It is an emirp because it is prime and its reverse (9697512497) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7942157969 is a prime.

It is a super-2 number, since 2×7942157969² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7942157963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3971078984 + 3971078985.

It is an arithmetic number, because the mean of its divisors is an integer number (3971078985).

Almost surely, 2^7942157969 is an apocalyptic number.

It is an amenable number.

7942157969 is a deficient number, since it is larger than the sum of its proper divisors (1).

7942157969 is an equidigital number, since it uses as much as digits as its factorization.

7942157969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 59.

The square root of 7942157969 is about 89118.7857244476. The cubic root of 7942157969 is about 1995.1681668448.

The spelling of 7942157969 in words is "seven billion, nine hundred forty-two million, one hundred fifty-seven thousand, nine hundred sixty-nine".