91402985 has 4 divisors (see below), whose sum is σ = 109683588. Its totient is φ = 73122384.

The previous prime is 91402963. The next prime is 91402991. The reversal of 91402985 is 58920419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35617024 + 55785961 = 5968^2 + 7469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91402985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9140294 + ... + 9140303.

It is an arithmetic number, because the mean of its divisors is an integer number (27420897).

Almost surely, 2^91402985 is an apocalyptic number.

It is an amenable number.

91402985 is a deficient number, since it is larger than the sum of its proper divisors (18280603).

91402985 is a wasteful number, since it uses less digits than its factorization.

91402985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18280602.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 91402985 is about 9560.4908346800. The cubic root of 91402985 is about 450.4571239594.

The spelling of 91402985 in words is "ninety-one million, four hundred two thousand, nine hundred eighty-five".