12145397111 has 4 divisors (see below), whose sum is σ = 12146642112. Its totient is φ = 12144152112.

The previous prime is 12145397107. The next prime is 12145397129. The reversal of 12145397111 is 11179354121.

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 12145397111 - 2² = 12145397107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145397711) 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, 607751 + ... + 627416.

It is an arithmetic number, because the mean of its divisors is an integer number (3036660528).

Almost surely, 2^12145397111 is an apocalyptic number.

12145397111 is a deficient number, since it is larger than the sum of its proper divisors (1245001).

12145397111 is an equidigital number, since it uses as much as digits as its factorization.

12145397111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245000.

The product of its digits is 7560, while the sum is 35.

Subtracting from 12145397111 its reverse (11179354121), we obtain a triangular number (966042990 = T₄₃₉₅₅).

The spelling of 12145397111 in words is "twelve billion, one hundred forty-five million, three hundred ninety-seven thousand, one hundred eleven".