91387077 has 16 divisors (see below), whose sum is σ = 125892480. Its totient is φ = 58923072.

The previous prime is 91387063. The next prime is 91387103. The reversal of 91387077 is 77078319.

It is a happy number.

It is not a de Polignac number, because 91387077 - 2⁶ = 91387013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91387007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16824 + ... + 21582.

It is an arithmetic number, because the mean of its divisors is an integer number (7868280).

Almost surely, 2^91387077 is an apocalyptic number.

It is an amenable number.

91387077 is a deficient number, since it is larger than the sum of its proper divisors (34505403).

91387077 is a wasteful number, since it uses less digits than its factorization.

91387077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972.

The product of its (nonzero) digits is 74088, while the sum is 42.

The square root of 91387077 is about 9559.6588328245. The cubic root of 91387077 is about 450.4309895551.

It can be divided in two parts, 913 and 87077, that added together give a triangular number (87990 = T₄₁₉).

The spelling of 91387077 in words is "ninety-one million, three hundred eighty-seven thousand, seventy-seven".