1251541231 has 2 divisors, whose sum is σ = 1251541232. Its totient is φ = 1251541230.

The previous prime is 1251541223. The next prime is 1251541261. The reversal of 1251541231 is 1321451521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251541231 - 2³ = 1251541223 is a prime.

It is a super-2 number, since 2×1251541231² = 3132710905785990722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1251541196 and 1251541205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251541261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625770615 + 625770616.

It is an arithmetic number, because the mean of its divisors is an integer number (625770616).

Almost surely, 2^1251541231 is an apocalyptic number.

1251541231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251541231 is an equidigital number, since it uses as much as digits as its factorization.

1251541231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 1251541231 is about 35377.1286426697. The cubic root of 1251541231 is about 1077.6598940512.

Adding to 1251541231 its reverse (1321451521), we get a palindrome (2572992752).

The spelling of 1251541231 in words is "one billion, two hundred fifty-one million, five hundred forty-one thousand, two hundred thirty-one".