91429391 has 2 divisors, whose sum is σ = 91429392. Its totient is φ = 91429390.

The previous prime is 91429379. The next prime is 91429411. The reversal of 91429391 is 19392419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91429391 - 2¹⁸ = 91167247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91428391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45714695 + 45714696.

It is an arithmetic number, because the mean of its divisors is an integer number (45714696).

Almost surely, 2^91429391 is an apocalyptic number.

91429391 is a deficient number, since it is larger than the sum of its proper divisors (1).

91429391 is an equidigital number, since it uses as much as digits as its factorization.

91429391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 91429391 is about 9561.8717309949. The cubic root of 91429391 is about 450.5004982743.

The spelling of 91429391 in words is "ninety-one million, four hundred twenty-nine thousand, three hundred ninety-one".