89661731 has 2 divisors, whose sum is σ = 89661732. Its totient is φ = 89661730.

The previous prime is 89661713. The next prime is 89661763. The reversal of 89661731 is 13716698.

Together with previous prime (89661713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89661731 is a prime.

It is a super-2 number, since 2×89661731² = 16078452011832722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89661031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44830865 + 44830866.

It is an arithmetic number, because the mean of its divisors is an integer number (44830866).

Almost surely, 2^89661731 is an apocalyptic number.

89661731 is a deficient number, since it is larger than the sum of its proper divisors (1).

89661731 is an equidigital number, since it uses as much as digits as its factorization.

89661731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 89661731 is about 9468.9878550983. The cubic root of 89661731 is about 447.5783178054.

The spelling of 89661731 in words is "eighty-nine million, six hundred sixty-one thousand, seven hundred thirty-one".