1252469639 has 2 divisors, whose sum is σ = 1252469640. Its totient is φ = 1252469638.

The previous prime is 1252469609. The next prime is 1252469653. The reversal of 1252469639 is 9369642521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1252469639 - 2¹⁶ = 1252404103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1252469593 and 1252469602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252469609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626234819 + 626234820.

It is an arithmetic number, because the mean of its divisors is an integer number (626234820).

Almost surely, 2^1252469639 is an apocalyptic number.

1252469639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252469639 is an equidigital number, since it uses as much as digits as its factorization.

1252469639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The square root of 1252469639 is about 35390.2477951201. The cubic root of 1252469639 is about 1077.9263017806.

The spelling of 1252469639 in words is "one billion, two hundred fifty-two million, four hundred sixty-nine thousand, six hundred thirty-nine".