87791951 has 18 divisors (see below), whose sum is σ = 100401120. Its totient is φ = 76720176.

The previous prime is 87791849. The next prime is 87791953. The reversal of 87791951 is 15919778.

It is not a de Polignac number, because 87791951 - 2¹⁸ = 87529807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87791896 and 87791905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87791953) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 60290 + ... + 61728.

It is an arithmetic number, because the mean of its divisors is an integer number (5577840).

Almost surely, 2^87791951 is an apocalyptic number.

87791951 is a deficient number, since it is larger than the sum of its proper divisors (12609169).

87791951 is a wasteful number, since it uses less digits than its factorization.

87791951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503 (or 1471 counting only the distinct ones).

The product of its digits is 158760, while the sum is 47.

The square root of 87791951 is about 9369.7359087650. The cubic root of 87791951 is about 444.4452136075.

The spelling of 87791951 in words is "eighty-seven million, seven hundred ninety-one thousand, nine hundred fifty-one".