90144497 has 4 divisors (see below), whose sum is σ = 93052416. Its totient is φ = 87236580.

The previous prime is 90144491. The next prime is 90144503. The reversal of 90144497 is 79444109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79444109 = 2939 ⋅27031.

It is an interprime number because it is at equal distance from previous prime (90144491) and next prime (90144503).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90144497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90144497.

It is not an unprimeable number, because it can be changed into a prime (90144491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453913 + ... + 1453974.

It is an arithmetic number, because the mean of its divisors is an integer number (23263104).

Almost surely, 2^90144497 is an apocalyptic number.

It is an amenable number.

90144497 is a deficient number, since it is larger than the sum of its proper divisors (2907919).

90144497 is a wasteful number, since it uses less digits than its factorization.

90144497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907918.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 90144497 is about 9494.4455867628. The cubic root of 90144497 is about 448.3801795812.

The spelling of 90144497 in words is "ninety million, one hundred forty-four thousand, four hundred ninety-seven".