91538351 has 2 divisors, whose sum is σ = 91538352. Its totient is φ = 91538350.

The previous prime is 91538347. The next prime is 91538389. The reversal of 91538351 is 15383519.

It is a weak prime.

It is an emirp because it is prime and its reverse (15383519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91538351 - 2² = 91538347 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91532351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45769175 + 45769176.

It is an arithmetic number, because the mean of its divisors is an integer number (45769176).

Almost surely, 2^91538351 is an apocalyptic number.

91538351 is a deficient number, since it is larger than the sum of its proper divisors (1).

91538351 is an equidigital number, since it uses as much as digits as its factorization.

91538351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 91538351 is about 9567.5676637273. The cubic root of 91538351 is about 450.6793869489.

The spelling of 91538351 in words is "ninety-one million, five hundred thirty-eight thousand, three hundred fifty-one".