11621491111 has 4 divisors (see below), whose sum is σ = 11624381032. Its totient is φ = 11618601192.

The previous prime is 11621491069. The next prime is 11621491121. The reversal of 11621491111 is 11119412611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11621491111 - 2⁷ = 11621490983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11621491111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621491121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438920 + ... + 1446973.

It is an arithmetic number, because the mean of its divisors is an integer number (2906095258).

Almost surely, 2^11621491111 is an apocalyptic number.

11621491111 is a deficient number, since it is larger than the sum of its proper divisors (2889921).

11621491111 is an equidigital number, since it uses as much as digits as its factorization.

11621491111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889920.

The product of its digits is 432, while the sum is 28.

The spelling of 11621491111 in words is "eleven billion, six hundred twenty-one million, four hundred ninety-one thousand, one hundred eleven".