89278561 has 2 divisors, whose sum is σ = 89278562. Its totient is φ = 89278560.

The previous prime is 89278547. The next prime is 89278573. The reversal of 89278561 is 16587298.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85100625 + 4177936 = 9225^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 89278561 - 2⁵ = 89278529 is a prime.

It is a super-2 number, since 2×89278561² = 15941322908461442, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (89278061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44639280 + 44639281.

It is an arithmetic number, because the mean of its divisors is an integer number (44639281).

Almost surely, 2^89278561 is an apocalyptic number.

It is an amenable number.

89278561 is a deficient number, since it is larger than the sum of its proper divisors (1).

89278561 is an equidigital number, since it uses as much as digits as its factorization.

89278561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 89278561 is about 9448.7333013479. The cubic root of 89278561 is about 446.9398311144.

The spelling of 89278561 in words is "eighty-nine million, two hundred seventy-eight thousand, five hundred sixty-one".