89178013 has 2 divisors, whose sum is σ = 89178014. Its totient is φ = 89178012.

The previous prime is 89177999. The next prime is 89178031. The reversal of 89178013 is 31087198.

89178013 = 6677² + 6678².

Together with next prime (89178031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44595684 + 44582329 = 6678^2 + 6677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89178013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89170013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44589006 + 44589007.

It is an arithmetic number, because the mean of its divisors is an integer number (44589007).

Almost surely, 2^89178013 is an apocalyptic number.

89178013 is the 6678-th centered square number.

It is an amenable number.

89178013 is a deficient number, since it is larger than the sum of its proper divisors (1).

89178013 is an equidigital number, since it uses as much as digits as its factorization.

89178013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 89178013 is about 9443.4110892198. The cubic root of 89178013 is about 446.7719827281.

The spelling of 89178013 in words is "eighty-nine million, one hundred seventy-eight thousand, thirteen".