91158415 has 8 divisors (see below), whose sum is σ = 109546560. Its totient is φ = 72822432.

The previous prime is 91158413. The next prime is 91158421. The reversal of 91158415 is 51485119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91158415 - 2¹ = 91158413 is a prime.

It is a super-3 number, since 3×91158415³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91158413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9084 + ... + 16273.

It is an arithmetic number, because the mean of its divisors is an integer number (13693320).

Almost surely, 2^91158415 is an apocalyptic number.

91158415 is a deficient number, since it is larger than the sum of its proper divisors (18388145).

91158415 is a wasteful number, since it uses less digits than its factorization.

91158415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26081.

The product of its digits is 7200, while the sum is 34.

The square root of 91158415 is about 9547.6916058281. The cubic root of 91158415 is about 450.0549973934.

It can be divided in two parts, 91 and 158415, that multiplied together give a triangular number (14415765 = T₅₃₆₉).

The spelling of 91158415 in words is "ninety-one million, one hundred fifty-eight thousand, four hundred fifteen".