90240591 has 16 divisors (see below), whose sum is σ = 137825024. Its totient is φ = 51447744.

The previous prime is 90240589. The next prime is 90240593. The reversal of 90240591 is 19504209.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90240589) and next prime (90240593).

It is not a de Polignac number, because 90240591 - 2¹ = 90240589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90240593) 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, 4896 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (8614064).

Almost surely, 2^90240591 is an apocalyptic number.

90240591 is a deficient number, since it is larger than the sum of its proper divisors (47584433).

90240591 is a wasteful number, since it uses less digits than its factorization.

90240591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9870.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 90240591 is about 9499.5047765660. The cubic root of 90240591 is about 448.5394473692.

It can be divided in two parts, 902405 and 91, that added together give a triangular number (902496 = T₁₃₄₃).

The spelling of 90240591 in words is "ninety million, two hundred forty thousand, five hundred ninety-one".