91261439 has 2 divisors, whose sum is σ = 91261440. Its totient is φ = 91261438.

The previous prime is 91261409. The next prime is 91261441. The reversal of 91261439 is 93416219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91261439 - 2¹⁶ = 91195903 is a prime.

Together with 91261441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91261399 and 91261408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91261409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45630719 + 45630720.

It is an arithmetic number, because the mean of its divisors is an integer number (45630720).

Almost surely, 2^91261439 is an apocalyptic number.

91261439 is a deficient number, since it is larger than the sum of its proper divisors (1).

91261439 is an equidigital number, since it uses as much as digits as its factorization.

91261439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 91261439 is about 9553.0853131331. The cubic root of 91261439 is about 450.2244789483.

The spelling of 91261439 in words is "ninety-one million, two hundred sixty-one thousand, four hundred thirty-nine".