1252365551 has 4 divisors (see below), whose sum is σ = 1295550600. Its totient is φ = 1209180504.

The previous prime is 1252365463. The next prime is 1252365599. The reversal of 1252365551 is 1555632521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555632521 = 53 ⋅29351557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252365551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252365251) 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 in 3 ways as a sum of consecutive naturals, for example, 21592481 + ... + 21592538.

It is an arithmetic number, because the mean of its divisors is an integer number (323887650).

Almost surely, 2^1252365551 is an apocalyptic number.

1252365551 is a deficient number, since it is larger than the sum of its proper divisors (43185049).

1252365551 is an equidigital number, since it uses as much as digits as its factorization.

1252365551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43185048.

The product of its digits is 45000, while the sum is 35.

The square root of 1252365551 is about 35388.7771899511. Note that the first 3 decimals coincide. The cubic root of 1252365551 is about 1077.8964401649.

The spelling of 1252365551 in words is "one billion, two hundred fifty-two million, three hundred sixty-five thousand, five hundred fifty-one".