1251320412 has 12 divisors (see below), whose sum is σ = 2919747656. Its totient is φ = 417106800.

The previous prime is 1251320387. The next prime is 1251320419. The reversal of 1251320412 is 2140231521.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251320419) 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, 52138339 + ... + 52138362.

Almost surely, 2^1251320412 is an apocalyptic number.

1251320412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251320412 is an abundant number, since it is smaller than the sum of its proper divisors (1668427244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251320412 is a wasteful number, since it uses less digits than its factorization.

1251320412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104276708 (or 104276706 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1251320412 is about 35374.0075761851. The cubic root of 1251320412 is about 1077.5965103951.

Adding to 1251320412 its reverse (2140231521), we get a palindrome (3391551933).

The spelling of 1251320412 in words is "one billion, two hundred fifty-one million, three hundred twenty thousand, four hundred twelve".