2611399961 has 2 divisors, whose sum is σ = 2611399962. Its totient is φ = 2611399960.

The previous prime is 2611399831. The next prime is 2611400009. The reversal of 2611399961 is 1699931162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2555808025 + 55591936 = 50555^2 + 7456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2611399961 - 2¹⁸ = 2611137817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2611399361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305699980 + 1305699981.

It is an arithmetic number, because the mean of its divisors is an integer number (1305699981).

Almost surely, 2^2611399961 is an apocalyptic number.

It is an amenable number.

2611399961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611399961 is an equidigital number, since it uses as much as digits as its factorization.

2611399961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 2611399961 is about 51101.8586843962. The cubic root of 2611399961 is about 1377.0756461121.

The spelling of 2611399961 in words is "two billion, six hundred eleven million, three hundred ninety-nine thousand, nine hundred sixty-one".