91148739 has 8 divisors (see below), whose sum is σ = 132580032. Its totient is φ = 55241640.

The previous prime is 91148737. The next prime is 91148753. The reversal of 91148739 is 93784119.

It is a happy number.

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

It is not a de Polignac number, because 91148739 - 2¹ = 91148737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91148739.

It is not an unprimeable number, because it can be changed into a prime (91148737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381009 + ... + 1381074.

It is an arithmetic number, because the mean of its divisors is an integer number (16572504).

Almost surely, 2^91148739 is an apocalyptic number.

91148739 is a deficient number, since it is larger than the sum of its proper divisors (41431293).

91148739 is a wasteful number, since it uses less digits than its factorization.

91148739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762097.

The product of its digits is 54432, while the sum is 42.

The square root of 91148739 is about 9547.1848730398. The cubic root of 91148739 is about 450.0390731504.

The spelling of 91148739 in words is "ninety-one million, one hundred forty-eight thousand, seven hundred thirty-nine".