1172912899261 has 2 divisors, whose sum is σ = 1172912899262. Its totient is φ = 1172912899260.

The previous prime is 1172912899243. The next prime is 1172912899289. The reversal of 1172912899261 is 1629982192711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622096590361 + 550816308900 = 788731^2 + 742170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1172912899261 - 2¹¹ = 1172912897213 is a prime.

It is a super-2 number, since 2×1172912899261² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1172912899196 and 1172912899205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1172912899231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586456449630 + 586456449631.

It is an arithmetic number, because the mean of its divisors is an integer number (586456449631).

Almost surely, 2^{1172912899261} is an apocalyptic number.

It is an amenable number.

1172912899261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172912899261 is an equidigital number, since it uses as much as digits as its factorization.

1172912899261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The spelling of 1172912899261 in words is "one trillion, one hundred seventy-two billion, nine hundred twelve million, eight hundred ninety-nine thousand, two hundred sixty-one".