91402289 has 16 divisors (see below), whose sum is σ = 102021120. Its totient is φ = 81191760.

The previous prime is 91402279. The next prime is 91402309. The reversal of 91402289 is 98220419.

It is a cyclic number.

It is not a de Polignac number, because 91402289 - 2¹⁶ = 91336753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91402279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92492 + ... + 93474.

It is an arithmetic number, because the mean of its divisors is an integer number (6376320).

Almost surely, 2^91402289 is an apocalyptic number.

It is an amenable number.

91402289 is a deficient number, since it is larger than the sum of its proper divisors (10618831).

91402289 is a wasteful number, since it uses less digits than its factorization.

91402289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 91402289 is about 9560.4544348059. The cubic root of 91402289 is about 450.4559806016.

The spelling of 91402289 in words is "ninety-one million, four hundred two thousand, two hundred eighty-nine".