91270389 has 12 divisors (see below), whose sum is σ = 141562464. Its totient is φ = 52154424.

The previous prime is 91270373. The next prime is 91270393. The reversal of 91270389 is 98307219.

It is not a de Polignac number, because 91270389 - 2⁴ = 91270373 is a prime.

It is a super-2 number, since 2×91270389² = 16660567816422642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91270339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310297 + ... + 310590.

It is an arithmetic number, because the mean of its divisors is an integer number (11796872).

Almost surely, 2^91270389 is an apocalyptic number.

It is an amenable number.

91270389 is a deficient number, since it is larger than the sum of its proper divisors (50292075).

91270389 is a wasteful number, since it uses less digits than its factorization.

91270389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620904 (or 620897 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 91270389 is about 9553.5537366992. The cubic root of 91270389 is about 450.2391962901.

It can be divided in two parts, 91 and 270389, that added together give a triangular number (270480 = T₇₃₅).

The spelling of 91270389 in words is "ninety-one million, two hundred seventy thousand, three hundred eighty-nine".