12154523261 has 2 divisors, whose sum is σ = 12154523262. Its totient is φ = 12154523260.

The previous prime is 12154523257. The next prime is 12154523279. The reversal of 12154523261 is 16232545121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8057755225 + 4096768036 = 89765^2 + 64006^2 .

It is a cyclic number.

It is not a de Polignac number, because 12154523261 - 2² = 12154523257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12154523281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077261630 + 6077261631.

It is an arithmetic number, because the mean of its divisors is an integer number (6077261631).

Almost surely, 2^12154523261 is an apocalyptic number.

It is an amenable number.

12154523261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154523261 is an equidigital number, since it uses as much as digits as its factorization.

12154523261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The spelling of 12154523261 in words is "twelve billion, one hundred fifty-four million, five hundred twenty-three thousand, two hundred sixty-one".