12154207691 has 4 divisors (see below), whose sum is σ = 12156852792. Its totient is φ = 12151562592.

The previous prime is 12154207657. The next prime is 12154207697. The reversal of 12154207691 is 19670245121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12154207691 - 2⁶ = 12154207627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12154207697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1315646 + ... + 1324851.

It is an arithmetic number, because the mean of its divisors is an integer number (3039213198).

Almost surely, 2^12154207691 is an apocalyptic number.

12154207691 is a deficient number, since it is larger than the sum of its proper divisors (2645101).

12154207691 is an equidigital number, since it uses as much as digits as its factorization.

12154207691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645100.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 12154207691 in words is "twelve billion, one hundred fifty-four million, two hundred seven thousand, six hundred ninety-one".