1252417381 has 2 divisors, whose sum is σ = 1252417382. Its totient is φ = 1252417380.

The previous prime is 1252417379. The next prime is 1252417409. The reversal of 1252417381 is 1837142521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243620225 + 8797156 = 35265^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252417381 - 2¹ = 1252417379 is a prime.

It is a super-2 number, since 2×1252417381² = 3137098592461798322, which contains 22 as substring.

Together with 1252417379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252417681) 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, 626208690 + 626208691.

It is an arithmetic number, because the mean of its divisors is an integer number (626208691).

Almost surely, 2^1252417381 is an apocalyptic number.

It is an amenable number.

1252417381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252417381 is an equidigital number, since it uses as much as digits as its factorization.

1252417381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 1252417381 is about 35389.5094766797. The cubic root of 1252417381 is about 1077.9113097855.

The spelling of 1252417381 in words is "one billion, two hundred fifty-two million, four hundred seventeen thousand, three hundred eighty-one".