1251210131 has 2 divisors, whose sum is σ = 1251210132. Its totient is φ = 1251210130.

The previous prime is 1251210091. The next prime is 1251210157. The reversal of 1251210131 is 1310121521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251210131 is a prime.

It is a super-2 number, since 2×1251210131² = 3131053583834074322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251215131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625605065 + 625605066.

It is an arithmetic number, because the mean of its divisors is an integer number (625605066).

Almost surely, 2^1251210131 is an apocalyptic number.

1251210131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251210131 is an equidigital number, since it uses as much as digits as its factorization.

1251210131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1251210131 is about 35372.4487560587. The cubic root of 1251210131 is about 1077.5648526596.

Adding to 1251210131 its reverse (1310121521), we get a palindrome (2561331652).

The spelling of 1251210131 in words is "one billion, two hundred fifty-one million, two hundred ten thousand, one hundred thirty-one".