88971721 has 4 divisors (see below), whose sum is σ = 89090944. Its totient is φ = 88852500.

The previous prime is 88971697. The next prime is 88971731. The reversal of 88971721 is 12717988.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 88971721 - 2⁷ = 88971593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88971731) 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, 58485 + ... + 59986.

It is an arithmetic number, because the mean of its divisors is an integer number (22272736).

Almost surely, 2^88971721 is an apocalyptic number.

It is an amenable number.

88971721 is a deficient number, since it is larger than the sum of its proper divisors (119223).

88971721 is a wasteful number, since it uses less digits than its factorization.

88971721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119222.

The product of its digits is 56448, while the sum is 43.

The square root of 88971721 is about 9432.4822289788. The cubic root of 88971721 is about 446.4272167115.

The spelling of 88971721 in words is "eighty-eight million, nine hundred seventy-one thousand, seven hundred twenty-one".