90733381 has 2 divisors, whose sum is σ = 90733382. Its totient is φ = 90733380.

The previous prime is 90733337. The next prime is 90733387. The reversal of 90733381 is 18333709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85932900 + 4800481 = 9270^2 + 2191^2 .

It is an emirp because it is prime and its reverse (18333709) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90733381 is a prime.

It is a super-2 number, since 2×90733381² = 16465092855382322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90733387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45366690 + 45366691.

It is an arithmetic number, because the mean of its divisors is an integer number (45366691).

Almost surely, 2^90733381 is an apocalyptic number.

It is an amenable number.

90733381 is a deficient number, since it is larger than the sum of its proper divisors (1).

90733381 is an equidigital number, since it uses as much as digits as its factorization.

90733381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 90733381 is about 9525.4071304066. The cubic root of 90733381 is about 449.3544339904.

The spelling of 90733381 in words is "ninety million, seven hundred thirty-three thousand, three hundred eighty-one".