90665051 has 4 divisors (see below), whose sum is σ = 91907112. Its totient is φ = 89422992.

The previous prime is 90665023. The next prime is 90665077. The reversal of 90665051 is 15056609.

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

It is a cyclic number.

It is not a de Polignac number, because 90665051 - 2¹⁴ = 90648667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90664999 and 90665017.

It is not an unprimeable number, because it can be changed into a prime (90665251) 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, 620921 + ... + 621066.

It is an arithmetic number, because the mean of its divisors is an integer number (22976778).

Almost surely, 2^90665051 is an apocalyptic number.

90665051 is a deficient number, since it is larger than the sum of its proper divisors (1242061).

90665051 is a wasteful number, since it uses less digits than its factorization.

90665051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242060.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 90665051 is about 9521.8197315429. The cubic root of 90665051 is about 449.2416048822.

The spelling of 90665051 in words is "ninety million, six hundred sixty-five thousand, fifty-one".