90998691 has 16 divisors (see below), whose sum is σ = 138799104. Its totient is φ = 51948864.

The previous prime is 90998689. The next prime is 90998693. The reversal of 90998691 is 19689909.

It is an interprime number because it is at equal distance from previous prime (90998689) and next prime (90998693).

It is not a de Polignac number, because 90998691 - 2¹ = 90998689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90998693) 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, 37095 + ... + 39471.

It is an arithmetic number, because the mean of its divisors is an integer number (8674944).

Almost surely, 2^90998691 is an apocalyptic number.

90998691 is a deficient number, since it is larger than the sum of its proper divisors (47800413).

90998691 is a wasteful number, since it uses less digits than its factorization.

90998691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 90998691 is about 9539.3234036802. The cubic root of 90998691 is about 449.7919878119.

The spelling of 90998691 in words is "ninety million, nine hundred ninety-eight thousand, six hundred ninety-one".