90739381 has 4 divisors (see below), whose sum is σ = 90759564. Its totient is φ = 90719200.

The previous prime is 90739379. The next prime is 90739399. The reversal of 90739381 is 18393709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18393709 = 223 ⋅82483.

It can be written as a sum of positive squares in 2 ways, for example, as 79816356 + 10923025 = 8934^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 90739381 - 2¹ = 90739379 is a prime.

It is a super-2 number, since 2×90739381² = 16467270528526322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90739351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51 + ... + 13471.

It is an arithmetic number, because the mean of its divisors is an integer number (22689891).

Almost surely, 2^90739381 is an apocalyptic number.

It is an amenable number.

90739381 is a deficient number, since it is larger than the sum of its proper divisors (20183).

90739381 is a wasteful number, since it uses less digits than its factorization.

90739381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20182.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 90739381 is about 9525.7220723681. The cubic root of 90739381 is about 449.3643387140.

The spelling of 90739381 in words is "ninety million, seven hundred thirty-nine thousand, three hundred eighty-one".