1252532721 has 8 divisors (see below), whose sum is σ = 1821865824. Its totient is φ = 759110720.

The previous prime is 1252532719. The next prime is 1252532777. The reversal of 1252532721 is 1272352521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1252532721 - 2¹ = 1252532719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1252532791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18977736 + ... + 18977801.

It is an arithmetic number, because the mean of its divisors is an integer number (227733228).

Almost surely, 2^1252532721 is an apocalyptic number.

1252532721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1252532721 is a deficient number, since it is larger than the sum of its proper divisors (569333103).

1252532721 is a wasteful number, since it uses less digits than its factorization.

1252532721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37955551.

The product of its digits is 8400, while the sum is 30.

The square root of 1252532721 is about 35391.1390181215. The cubic root of 1252532721 is about 1077.9443984549.

The spelling of 1252532721 in words is "one billion, two hundred fifty-two million, five hundred thirty-two thousand, seven hundred twenty-one".