90266981 has 4 divisors (see below), whose sum is σ = 103162272. Its totient is φ = 77371692.

The previous prime is 90266977. The next prime is 90266983. The reversal of 90266981 is 18966209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90266981 - 2² = 90266977 is a prime.

It is a super-2 number, since 2×90266981² = 16296255717708722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90266983) 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, 6447635 + ... + 6447648.

It is an arithmetic number, because the mean of its divisors is an integer number (25790568).

Almost surely, 2^90266981 is an apocalyptic number.

It is an amenable number.

90266981 is a deficient number, since it is larger than the sum of its proper divisors (12895291).

90266981 is a wasteful number, since it uses less digits than its factorization.

90266981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12895290.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 90266981 is about 9500.8936948058. The cubic root of 90266981 is about 448.5831668019.

The spelling of 90266981 in words is "ninety million, two hundred sixty-six thousand, nine hundred eighty-one".