91431801 has 8 divisors (see below), whose sum is σ = 135454560. Its totient is φ = 60954516.

The previous prime is 91431757. The next prime is 91431817. The reversal of 91431801 is 10813419.

It is not a de Polignac number, because 91431801 - 2⁶ = 91431737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3386363 = 91431801 / (9 + 1 + 4 + 3 + 1 + 8 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (91431881) 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, 1693155 + ... + 1693208.

It is an arithmetic number, because the mean of its divisors is an integer number (16931820).

Almost surely, 2^91431801 is an apocalyptic number.

It is an amenable number.

91431801 is a deficient number, since it is larger than the sum of its proper divisors (44022759).

91431801 is a wasteful number, since it uses less digits than its factorization.

91431801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386372 (or 3386366 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 91431801 is about 9561.9977515162. The cubic root of 91431801 is about 450.5044565079.

The spelling of 91431801 in words is "ninety-one million, four hundred thirty-one thousand, eight hundred one".