90842991 has 4 divisors (see below), whose sum is σ = 121123992. Its totient is φ = 60561992.

The previous prime is 90842957. The next prime is 90843017. The reversal of 90842991 is 19924809.

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 90842991 - 2⁷ = 90842863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90842891) 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, 15140496 + ... + 15140501.

It is an arithmetic number, because the mean of its divisors is an integer number (30280998).

Almost surely, 2^90842991 is an apocalyptic number.

90842991 is a deficient number, since it is larger than the sum of its proper divisors (30281001).

90842991 is a wasteful number, since it uses less digits than its factorization.

90842991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30281000.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 90842991 is about 9531.1589536635. The cubic root of 90842991 is about 449.5353079557.

The spelling of 90842991 in words is "ninety million, eight hundred forty-two thousand, nine hundred ninety-one".