7987507951 has 4 divisors (see below), whose sum is σ = 7988066632. Its totient is φ = 7986949272.

The previous prime is 7987507939. The next prime is 7987508003. The reversal of 7987507951 is 1597057897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1597057897 = 61 ⋅26181277.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7987507951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987507921) 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, 257316 + ... + 286681.

It is an arithmetic number, because the mean of its divisors is an integer number (1997016658).

Almost surely, 2^7987507951 is an apocalyptic number.

7987507951 is a deficient number, since it is larger than the sum of its proper divisors (558681).

7987507951 is a wasteful number, since it uses less digits than its factorization.

7987507951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558680.

The product of its (nonzero) digits is 5556600, while the sum is 58.

The square root of 7987507951 is about 89372.8591407928. The cubic root of 7987507951 is about 1998.9584536014.

The spelling of 7987507951 in words is "seven billion, nine hundred eighty-seven million, five hundred seven thousand, nine hundred fifty-one".