12251381 has 4 divisors (see below), whose sum is σ = 12399072. Its totient is φ = 12103692.

The previous prime is 12251363. The next prime is 12251389. The reversal of 12251381 is 18315221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12251381 is a prime.

It is a super-2 number, since 2×12251381² = 300192672814322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12251389) 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, 73721 + ... + 73886.

It is an arithmetic number, because the mean of its divisors is an integer number (3099768).

Almost surely, 2^12251381 is an apocalyptic number.

It is an amenable number.

12251381 is a deficient number, since it is larger than the sum of its proper divisors (147691).

12251381 is an equidigital number, since it uses as much as digits as its factorization.

12251381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147690.

The product of its digits is 480, while the sum is 23.

The square root of 12251381 is about 3500.1972801544. The cubic root of 12251381 is about 230.5304768795.

The spelling of 12251381 in words is "twelve million, two hundred fifty-one thousand, three hundred eighty-one".