11815961 has 2 divisors, whose sum is σ = 11815962. Its totient is φ = 11815960.

The previous prime is 11815957. The next prime is 11816009. The reversal of 11815961 is 16951811.

11815961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6031936 + 5784025 = 2456^2 + 2405^2 .

It is an emirp because it is prime and its reverse (16951811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11815961 - 2² = 11815957 is a prime.

It is not a weakly prime, because it can be changed into another prime (11815361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907980 + 5907981.

It is an arithmetic number, because the mean of its divisors is an integer number (5907981).

Almost surely, 2^11815961 is an apocalyptic number.

It is an amenable number.

11815961 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815961 is an equidigital number, since it uses as much as digits as its factorization.

11815961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 32.

The square root of 11815961 is about 3437.4352357535. The cubic root of 11815961 is about 227.7664133313.

The spelling of 11815961 in words is "eleven million, eight hundred fifteen thousand, nine hundred sixty-one".