1252736257 has 4 divisors (see below), whose sum is σ = 1293147136. Its totient is φ = 1212325380.

The previous prime is 1252736227. The next prime is 1252736293. The reversal of 1252736257 is 7526372521.

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 an emirpimes, since its reverse is a distinct semiprime: 7526372521 = 83 ⋅90679187.

It is a cyclic number.

It is not a de Polignac number, because 1252736257 - 2⁷ = 1252736129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252736207) 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, 20205393 + ... + 20205454.

It is an arithmetic number, because the mean of its divisors is an integer number (323286784).

Almost surely, 2^1252736257 is an apocalyptic number.

It is an amenable number.

1252736257 is a deficient number, since it is larger than the sum of its proper divisors (40410879).

1252736257 is an equidigital number, since it uses as much as digits as its factorization.

1252736257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410878.

The product of its digits is 176400, while the sum is 40.

The square root of 1252736257 is about 35394.0144233457. The cubic root of 1252736257 is about 1078.0027837847.

It can be divided in two parts, 12527 and 36257, that added together give a palindrome (48784).

The spelling of 1252736257 in words is "one billion, two hundred fifty-two million, seven hundred thirty-six thousand, two hundred fifty-seven".