90984961 has 4 divisors (see below), whose sum is σ = 93444052. Its totient is φ = 88525872.

The previous prime is 90984931. The next prime is 90985007. The reversal of 90984961 is 16948909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16948909 = 31 ⋅546739.

It can be written as a sum of positive squares in 2 ways, for example, as 35034561 + 55950400 = 5919^2 + 7480^2 .

It is a cyclic number.

It is not a de Polignac number, because 90984961 - 2¹⁹ = 90460673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90984931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229490 + ... + 1229563.

It is an arithmetic number, because the mean of its divisors is an integer number (23361013).

Almost surely, 2^90984961 is an apocalyptic number.

It is an amenable number.

90984961 is a deficient number, since it is larger than the sum of its proper divisors (2459091).

90984961 is a wasteful number, since it uses less digits than its factorization.

90984961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459090.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 90984961 is about 9538.6037238162. The cubic root of 90984961 is about 449.7693649421.

The spelling of 90984961 in words is "ninety million, nine hundred eighty-four thousand, nine hundred sixty-one".