261163113031 has 2 divisors, whose sum is σ = 261163113032. Its totient is φ = 261163113030.

The previous prime is 261163112993. The next prime is 261163113059. The reversal of 261163113031 is 130311361162.

It is an a-pointer prime, because the next prime (261163113059) can be obtained adding 261163113031 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261163113031 - 2⁹ = 261163112519 is a prime.

It is a super-2 number, since 2×261163113031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261163113061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130581556515 + 130581556516.

It is an arithmetic number, because the mean of its divisors is an integer number (130581556516).

Almost surely, 2^261163113031 is an apocalyptic number.

261163113031 is a deficient number, since it is larger than the sum of its proper divisors (1).

261163113031 is an equidigital number, since it uses as much as digits as its factorization.

261163113031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

Adding to 261163113031 its reverse (130311361162), we get a palindrome (391474474193).

The spelling of 261163113031 in words is "two hundred sixty-one billion, one hundred sixty-three million, one hundred thirteen thousand, thirty-one".