90744551 has 4 divisors (see below), whose sum is σ = 95520600. Its totient is φ = 85968504.

The previous prime is 90744541. The next prime is 90744557. The reversal of 90744551 is 15544709.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90744551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90744557) 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, 2387996 + ... + 2388033.

It is an arithmetic number, because the mean of its divisors is an integer number (23880150).

Almost surely, 2^90744551 is an apocalyptic number.

90744551 is a deficient number, since it is larger than the sum of its proper divisors (4776049).

90744551 is a wasteful number, since it uses less digits than its factorization.

90744551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776048.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 90744551 is about 9525.9934390068. The cubic root of 90744551 is about 449.3728729339.

The spelling of 90744551 in words is "ninety million, seven hundred forty-four thousand, five hundred fifty-one".