90920091 has 4 divisors (see below), whose sum is σ = 121226792. Its totient is φ = 60613392.

The previous prime is 90920077. The next prime is 90920107. The reversal of 90920091 is 19002909.

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

It is not a de Polignac number, because 90920091 - 2⁵ = 90920059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90920021) 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, 15153346 + ... + 15153351.

It is an arithmetic number, because the mean of its divisors is an integer number (30306698).

Almost surely, 2^90920091 is an apocalyptic number.

90920091 is a deficient number, since it is larger than the sum of its proper divisors (30306701).

90920091 is a wasteful number, since it uses less digits than its factorization.

90920091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30306700.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 90920091 is about 9535.2027246409. The cubic root of 90920091 is about 449.6624480950.

The spelling of 90920091 in words is "ninety million, nine hundred twenty thousand, ninety-one".