1252757281 has 4 divisors (see below), whose sum is σ = 1252833472. Its totient is φ = 1252681092.

The previous prime is 1252757279. The next prime is 1252757293. The reversal of 1252757281 is 1827572521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1827572521 = 317 ⋅5765213.

It is a cyclic number.

It is not a de Polignac number, because 1252757281 - 2¹ = 1252757279 is a prime.

It is a super-2 number, since 2×1252757281² = 3138801610197025922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252757981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085 + ... + 50098.

It is an arithmetic number, because the mean of its divisors is an integer number (313208368).

Almost surely, 2^1252757281 is an apocalyptic number.

It is an amenable number.

1252757281 is a deficient number, since it is larger than the sum of its proper divisors (76191).

1252757281 is an equidigital number, since it uses as much as digits as its factorization.

1252757281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76190.

The product of its digits is 78400, while the sum is 40.

The square root of 1252757281 is about 35394.3114214700. The cubic root of 1252757281 is about 1078.0088142649.

The spelling of 1252757281 in words is "one billion, two hundred fifty-two million, seven hundred fifty-seven thousand, two hundred eighty-one".