1252507081 has 6 divisors (see below), whose sum is σ = 1456998090. Its totient is φ = 1073577456.

The previous prime is 1252507051. The next prime is 1252507093. The reversal of 1252507081 is 1807052521.

It can be written as a sum of positive squares in only one way, i.e., 712409481 + 540097600 = 26691^2 + 23240^2 .

It is not a de Polignac number, because 1252507081 - 2¹⁹ = 1251982793 is a prime.

It is a super-2 number, since 2×1252507081² = 3137547975910281122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252507031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12780636 + ... + 12780733.

It is an arithmetic number, because the mean of its divisors is an integer number (242833015).

Almost surely, 2^1252507081 is an apocalyptic number.

It is an amenable number.

1252507081 is a deficient number, since it is larger than the sum of its proper divisors (204491009).

1252507081 is an equidigital number, since it uses as much as digits as its factorization.

1252507081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25561383 (or 25561376 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 1252507081 is about 35390.7767787032. The cubic root of 1252507081 is about 1077.9370430428.

The spelling of 1252507081 in words is "one billion, two hundred fifty-two million, five hundred seven thousand, eighty-one".