91551433 has 2 divisors, whose sum is σ = 91551434. Its totient is φ = 91551432.

The previous prime is 91551419. The next prime is 91551437. The reversal of 91551433 is 33415519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48622729 + 42928704 = 6973^2 + 6552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91551433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91551395 and 91551404.

It is not a weakly prime, because it can be changed into another prime (91551437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45775716 + 45775717.

It is an arithmetic number, because the mean of its divisors is an integer number (45775717).

Almost surely, 2^91551433 is an apocalyptic number.

It is an amenable number.

91551433 is a deficient number, since it is larger than the sum of its proper divisors (1).

91551433 is an equidigital number, since it uses as much as digits as its factorization.

91551433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 91551433 is about 9568.2513031379. The cubic root of 91551433 is about 450.7008552073.

The spelling of 91551433 in words is "ninety-one million, five hundred fifty-one thousand, four hundred thirty-three".