1251541251 has 12 divisors (see below), whose sum is σ = 1886381328. Its totient is φ = 798084144.

The previous prime is 1251541231. The next prime is 1251541261. The reversal of 1251541251 is 1521451521.

It is a happy number.

It is not a de Polignac number, because 1251541251 - 2⁹ = 1251540739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251541231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3022840 + ... + 3023253.

It is an arithmetic number, because the mean of its divisors is an integer number (157198444).

Almost surely, 2^1251541251 is an apocalyptic number.

1251541251 is a deficient number, since it is larger than the sum of its proper divisors (634840077).

1251541251 is a wasteful number, since it uses less digits than its factorization.

1251541251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046122 (or 6046119 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1251541251 is about 35377.1289253382. The cubic root of 1251541251 is about 1077.6598997917.

Adding to 1251541251 its reverse (1521451521), we get a palindrome (2772992772).

The spelling of 1251541251 in words is "one billion, two hundred fifty-one million, five hundred forty-one thousand, two hundred fifty-one".