11491952481 has 6 divisors (see below), whose sum is σ = 16599486930. Its totient is φ = 7661301648.

The previous prime is 11491952477. The next prime is 11491952503. The reversal of 11491952481 is 18425919411.

It is a happy number.

11491952481 is a `hidden beast` number, since 1 + 1 + 49 + 1 + 9 + 524 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10819328256 + 672624225 = 104016^2 + 25935^2 .

It is not a de Polignac number, because 11491952481 - 2² = 11491952477 is a prime.

It is a super-2 number, since 2×11491952481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11491952411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 638441796 + ... + 638441813.

It is an arithmetic number, because the mean of its divisors is an integer number (2766581155).

Almost surely, 2^11491952481 is an apocalyptic number.

It is an amenable number.

11491952481 is a deficient number, since it is larger than the sum of its proper divisors (5107534449).

11491952481 is a wasteful number, since it uses less digits than its factorization.

11491952481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276883615 (or 1276883612 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The spelling of 11491952481 in words is "eleven billion, four hundred ninety-one million, nine hundred fifty-two thousand, four hundred eighty-one".