11361981 has 16 divisors (see below), whose sum is σ = 16251840. Its totient is φ = 7038720.

The previous prime is 11361971. The next prime is 11361983. The reversal of 11361981 is 18916311.

It is not a de Polignac number, because 11361981 - 2⁵ = 11361949 is a prime.

It is a super-2 number, since 2×11361981² = 258189224488722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11361983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141 + ... + 4901.

It is an arithmetic number, because the mean of its divisors is an integer number (1015740).

Almost surely, 2^11361981 is an apocalyptic number.

It is an amenable number.

11361981 is a deficient number, since it is larger than the sum of its proper divisors (4889859).

11361981 is a wasteful number, since it uses less digits than its factorization.

11361981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836.

The product of its digits is 1296, while the sum is 30.

The square root of 11361981 is about 3370.7537732679. The cubic root of 11361981 is about 224.8112392168.

The spelling of 11361981 in words is "eleven million, three hundred sixty-one thousand, nine hundred eighty-one".