88819561 has 2 divisors, whose sum is σ = 88819562. Its totient is φ = 88819560.

The previous prime is 88819541. The next prime is 88819579. The reversal of 88819561 is 16591888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88266025 + 553536 = 9395^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 88819561 - 2⁵ = 88819529 is a prime.

It is not a weakly prime, because it can be changed into another prime (88819531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44409780 + 44409781.

It is an arithmetic number, because the mean of its divisors is an integer number (44409781).

Almost surely, 2^88819561 is an apocalyptic number.

It is an amenable number.

88819561 is a deficient number, since it is larger than the sum of its proper divisors (1).

88819561 is an equidigital number, since it uses as much as digits as its factorization.

88819561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 46.

The square root of 88819561 is about 9424.4130321204. The cubic root of 88819561 is about 446.1725772777.

It can be divided in two parts, 888 and 19561, that added together give a square (20449 = 143²).

The spelling of 88819561 in words is "eighty-eight million, eight hundred nineteen thousand, five hundred sixty-one".