91629389 has 2 divisors, whose sum is σ = 91629390. Its totient is φ = 91629388.

The previous prime is 91629361. The next prime is 91629407. The reversal of 91629389 is 98392619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89453764 + 2175625 = 9458^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 91629389 - 2²⁰ = 90580813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (96629389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45814694 + 45814695.

It is an arithmetic number, because the mean of its divisors is an integer number (45814695).

Almost surely, 2^91629389 is an apocalyptic number.

It is an amenable number.

91629389 is a deficient number, since it is larger than the sum of its proper divisors (1).

91629389 is an equidigital number, since it uses as much as digits as its factorization.

91629389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 91629389 is about 9572.3241169530. The cubic root of 91629389 is about 450.8287427673.

The spelling of 91629389 in words is "ninety-one million, six hundred twenty-nine thousand, three hundred eighty-nine".