91449637 has 2 divisors, whose sum is σ = 91449638. Its totient is φ = 91449636.

The previous prime is 91449601. The next prime is 91449643. The reversal of 91449637 is 73694419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84658401 + 6791236 = 9201^2 + 2606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91449637 is a prime.

It is a super-2 number, since 2×91449637² = 16726072214863538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91449593 and 91449602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91449667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45724818 + 45724819.

It is an arithmetic number, because the mean of its divisors is an integer number (45724819).

Almost surely, 2^91449637 is an apocalyptic number.

It is an amenable number.

91449637 is a deficient number, since it is larger than the sum of its proper divisors (1).

91449637 is an equidigital number, since it uses as much as digits as its factorization.

91449637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 91449637 is about 9562.9303563291. The cubic root of 91449637 is about 450.5337485593.

It can be divided in two parts, 9144 and 9637, that added together give a palindrome (18781).

The spelling of 91449637 in words is "ninety-one million, four hundred forty-nine thousand, six hundred thirty-seven".