91151438 has 16 divisors (see below), whose sum is σ = 163054080. Its totient is φ = 37366296.

The previous prime is 91151429. The next prime is 91151447. The reversal of 91151438 is 83415119.

It is an interprime number because it is at equal distance from previous prime (91151429) and next prime (91151447).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141218 + ... + 141861.

It is an arithmetic number, because the mean of its divisors is an integer number (10190880).

Almost surely, 2^91151438 is an apocalyptic number.

91151438 is a deficient number, since it is larger than the sum of its proper divisors (71902642).

91151438 is a wasteful number, since it uses less digits than its factorization.

91151438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283111.

The product of its digits is 4320, while the sum is 32.

The square root of 91151438 is about 9547.3262225610. The cubic root of 91151438 is about 450.0435151335.

The spelling of 91151438 in words is "ninety-one million, one hundred fifty-one thousand, four hundred thirty-eight".