91411289649 has 27 divisors (see below), whose sum is σ = 136477213977. Its totient is φ = 58956885000.

The previous prime is 91411289639. The next prime is 91411289653. The reversal of 91411289649 is 94698211419.

The square root of 91411289649 is 302343.

It is a perfect power (a square), and thus also a powerful number.

91411289649 is a `hidden beast` number, since 91 + 411 + 2 + 89 + 64 + 9 = 666.

It is not a de Polignac number, because 91411289649 - 2⁵ = 91411289617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91411289595 and 91411289604.

It is not an unprimeable number, because it can be changed into a prime (91411289639) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28116274 + ... + 28119524.

Almost surely, 2^91411289649 is an apocalyptic number.

91411289649 is the 302343-rd square number.

91411289649 is the 151172-nd centered octagonal number.

It is an amenable number.

91411289649 is a deficient number, since it is larger than the sum of its proper divisors (45065924328).

91411289649 is an frugal number, since it uses more digits than its factorization.

91411289649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6570 (or 3285 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The spelling of 91411289649 in words is "ninety-one billion, four hundred eleven million, two hundred eighty-nine thousand, six hundred forty-nine".