91491345 has 24 divisors (see below), whose sum is σ = 173002752. Its totient is φ = 44359200.

The previous prime is 91491341. The next prime is 91491373. The reversal of 91491345 is 54319419.

It is a happy number.

It is not a de Polignac number, because 91491345 - 2² = 91491341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91491341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91921 + ... + 92910.

It is an arithmetic number, because the mean of its divisors is an integer number (7208448).

Almost surely, 2^91491345 is an apocalyptic number.

It is an amenable number.

91491345 is a deficient number, since it is larger than the sum of its proper divisors (81511407).

91491345 is a wasteful number, since it uses less digits than its factorization.

91491345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184853 (or 184850 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 91491345 is about 9565.1108200585. The cubic root of 91491345 is about 450.6022307179.

The spelling of 91491345 in words is "ninety-one million, four hundred ninety-one thousand, three hundred forty-five".