90622981 has 4 divisors (see below), whose sum is σ = 90647392. Its totient is φ = 90598572.

The previous prime is 90622933. The next prime is 90622991. The reversal of 90622981 is 18922609.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18922609 = 67 ⋅282427.

It is a cyclic number.

It is not a de Polignac number, because 90622981 - 2¹⁹ = 90098693 is a prime.

It is a super-2 number, since 2×90622981² = 16425049370652722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90622981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90622991) 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, 5355 + ... + 14488.

It is an arithmetic number, because the mean of its divisors is an integer number (22661848).

Almost surely, 2^90622981 is an apocalyptic number.

It is an amenable number.

90622981 is a deficient number, since it is larger than the sum of its proper divisors (24411).

90622981 is a wasteful number, since it uses less digits than its factorization.

90622981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24410.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 90622981 is about 9519.6103386641. The cubic root of 90622981 is about 449.1721090912.

The spelling of 90622981 in words is "ninety million, six hundred twenty-two thousand, nine hundred eighty-one".