7915916981 has 4 divisors (see below), whose sum is σ = 9046762272. Its totient is φ = 6785071692.

The previous prime is 7915916917. The next prime is 7915917001. The reversal of 7915916981 is 1896195197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7915916981 - 2⁶ = 7915916917 is a prime.

It is a super-2 number, since 2×7915916981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7915916081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565422635 + ... + 565422648.

It is an arithmetic number, because the mean of its divisors is an integer number (2261690568).

Almost surely, 2^7915916981 is an apocalyptic number.

It is an amenable number.

7915916981 is a deficient number, since it is larger than the sum of its proper divisors (1130845291).

7915916981 is a wasteful number, since it uses less digits than its factorization.

7915916981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130845290.

The product of its digits is 1224720, while the sum is 56.

The square root of 7915916981 is about 88971.4391307683. The cubic root of 7915916981 is about 1992.9683889453.

The spelling of 7915916981 in words is "seven billion, nine hundred fifteen million, nine hundred sixteen thousand, nine hundred eighty-one".