1252451261 has 2 divisors, whose sum is σ = 1252451262. Its totient is φ = 1252451260.

The previous prime is 1252451219. The next prime is 1252451281. The reversal of 1252451261 is 1621542521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626500900 + 625950361 = 25030^2 + 25019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252451261 is a prime.

It is a super-2 number, since 2×1252451261² = 3137268322360980242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252451281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626225630 + 626225631.

It is an arithmetic number, because the mean of its divisors is an integer number (626225631).

Almost surely, 2^1252451261 is an apocalyptic number.

It is an amenable number.

1252451261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252451261 is an equidigital number, since it uses as much as digits as its factorization.

1252451261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 1252451261 is about 35389.9881463670. The cubic root of 1252451261 is about 1077.9210294701.

Adding to 1252451261 its reverse (1621542521), we get a palindrome (2873993782).

The spelling of 1252451261 in words is "one billion, two hundred fifty-two million, four hundred fifty-one thousand, two hundred sixty-one".