90120551 has 8 divisors (see below), whose sum is σ = 91137984. Its totient is φ = 89107200.

The previous prime is 90120539. The next prime is 90120557. The reversal of 90120551 is 15502109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90120551 - 2¹⁴ = 90104167 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 (90120557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67250 + ... + 68576.

It is an arithmetic number, because the mean of its divisors is an integer number (11392248).

Almost surely, 2^90120551 is an apocalyptic number.

90120551 is a deficient number, since it is larger than the sum of its proper divisors (1017433).

90120551 is a wasteful number, since it uses less digits than its factorization.

90120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 90120551 is about 9493.1844499093. The cubic root of 90120551 is about 448.3404734686.

The spelling of 90120551 in words is "ninety million, one hundred twenty thousand, five hundred fifty-one".