91370381 has 2 divisors, whose sum is σ = 91370382. Its totient is φ = 91370380.

The previous prime is 91370351. The next prime is 91370407. The reversal of 91370381 is 18307319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 41088100 = 7091^2 + 6410^2 .

It is an emirp because it is prime and its reverse (18307319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91370381 - 2¹⁰ = 91369357 is a prime.

It is a super-2 number, since 2×91370381² = 16697093048170322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91370351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685190 + 45685191.

It is an arithmetic number, because the mean of its divisors is an integer number (45685191).

Almost surely, 2^91370381 is an apocalyptic number.

It is an amenable number.

91370381 is a deficient number, since it is larger than the sum of its proper divisors (1).

91370381 is an equidigital number, since it uses as much as digits as its factorization.

91370381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 91370381 is about 9558.7855400150. The cubic root of 91370381 is about 450.4035573256.

The spelling of 91370381 in words is "ninety-one million, three hundred seventy thousand, three hundred eighty-one".