2661206131 has 2 divisors, whose sum is σ = 2661206132. Its totient is φ = 2661206130.

The previous prime is 2661206123. The next prime is 2661206137. The reversal of 2661206131 is 1316021662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661206131 - 2³ = 2661206123 is a prime.

It is a super-2 number, since 2×2661206131² = 14164036143343978322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2661206131.

It is not a weakly prime, because it can be changed into another prime (2661206137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330603065 + 1330603066.

It is an arithmetic number, because the mean of its divisors is an integer number (1330603066).

Almost surely, 2^2661206131 is an apocalyptic number.

2661206131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661206131 is an equidigital number, since it uses as much as digits as its factorization.

2661206131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2661206131 is about 51586.8794462313. The cubic root of 2661206131 is about 1385.7753709024.

Adding to 2661206131 its reverse (1316021662), we get a palindrome (3977227793).

The spelling of 2661206131 in words is "two billion, six hundred sixty-one million, two hundred six thousand, one hundred thirty-one".