90914381 has 2 divisors, whose sum is σ = 90914382. Its totient is φ = 90914380.

The previous prime is 90914371. The next prime is 90914389. The reversal of 90914381 is 18341909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82264900 + 8649481 = 9070^2 + 2941^2 .

It is an emirp because it is prime and its reverse (18341909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90914381 - 2¹⁰ = 90913357 is a prime.

It is a super-2 number, since 2×90914381² = 16530849345226322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_5266961 and since 90914381 and 5266961 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90914389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45457190 + 45457191.

It is an arithmetic number, because the mean of its divisors is an integer number (45457191).

Almost surely, 2^90914381 is an apocalyptic number.

It is an amenable number.

90914381 is a deficient number, since it is larger than the sum of its proper divisors (1).

90914381 is an equidigital number, since it uses as much as digits as its factorization.

90914381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 90914381 is about 9534.9033031279. The cubic root of 90914381 is about 449.6530346042.

The spelling of 90914381 in words is "ninety million, nine hundred fourteen thousand, three hundred eighty-one".