1251841361 has 4 divisors (see below), whose sum is σ = 1254667632. Its totient is φ = 1249015092.

The previous prime is 1251841307. The next prime is 1251841373. The reversal of 1251841361 is 1631481521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1631481521 = 1459 ⋅1118219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251841361 is a prime.

It is a super-2 number, since 2×1251841361² = 3134213586220664642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251844361) 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, 1412471 + ... + 1413356.

It is an arithmetic number, because the mean of its divisors is an integer number (313666908).

Almost surely, 2^1251841361 is an apocalyptic number.

It is an amenable number.

1251841361 is a deficient number, since it is larger than the sum of its proper divisors (2826271).

1251841361 is an equidigital number, since it uses as much as digits as its factorization.

1251841361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826270.

The product of its digits is 5760, while the sum is 32.

The square root of 1251841361 is about 35381.3702532844. The cubic root of 1251841361 is about 1077.7460311024.

The spelling of 1251841361 in words is "one billion, two hundred fifty-one million, eight hundred forty-one thousand, three hundred sixty-one".