11949290081 has 6 divisors (see below), whose sum is σ = 12233645010. Its totient is φ = 11671397808.

The previous prime is 11949290063. The next prime is 11949290137. The reversal of 11949290081 is 18009294911.

It can be written as a sum of positive squares in only one way, i.e., 10765930081 + 1183360000 = 103759^2 + 34400^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11949290081 is a prime.

It is a super-2 number, since 2×11949290081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11949290581) 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, 3229436 + ... + 3233133.

It is an arithmetic number, because the mean of its divisors is an integer number (2038940835).

Almost surely, 2^11949290081 is an apocalyptic number.

It is an amenable number.

11949290081 is a deficient number, since it is larger than the sum of its proper divisors (284354929).

11949290081 is an frugal number, since it uses more digits than its factorization.

11949290081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462655 (or 6462612 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 11949290081 in words is "eleven billion, nine hundred forty-nine million, two hundred ninety thousand, eighty-one".