11681937 has 6 divisors (see below), whose sum is σ = 16873922. Its totient is φ = 7787952.

The previous prime is 11681933. The next prime is 11681959. The reversal of 11681937 is 73918611.

It can be written as a sum of positive squares in only one way, i.e., 11350161 + 331776 = 3369^2 + 576^2 .

It is not a de Polignac number, because 11681937 - 2² = 11681933 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11681933) 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, 648988 + ... + 649005.

Almost surely, 2^11681937 is an apocalyptic number.

It is an amenable number.

11681937 is a deficient number, since it is larger than the sum of its proper divisors (5191985).

11681937 is a wasteful number, since it uses less digits than its factorization.

11681937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297999 (or 1297996 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11681937 is about 3417.8848722565. The cubic root of 11681937 is about 226.9019804900.

The spelling of 11681937 in words is "eleven million, six hundred eighty-one thousand, nine hundred thirty-seven".