2511131261 has 2 divisors, whose sum is σ = 2511131262. Its totient is φ = 2511131260.

The previous prime is 2511131201. The next prime is 2511131263. The reversal of 2511131261 is 1621311152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1542054361 + 969076900 = 39269^2 + 31130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2511131261 - 2⁶ = 2511131197 is a prime.

It is a Sophie Germain prime.

Together with 2511131263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2511131263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255565630 + 1255565631.

It is an arithmetic number, because the mean of its divisors is an integer number (1255565631).

Almost surely, 2^2511131261 is an apocalyptic number.

It is an amenable number.

2511131261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511131261 is an equidigital number, since it uses as much as digits as its factorization.

2511131261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 2511131261 is about 50111.1889801070. The cubic root of 2511131261 is about 1359.2201521357.

The spelling of 2511131261 in words is "two billion, five hundred eleven million, one hundred thirty-one thousand, two hundred sixty-one".