1252215761 has 4 divisors (see below), whose sum is σ = 1253844900. Its totient is φ = 1250586624.

The previous prime is 1252215719. The next prime is 1252215773. The reversal of 1252215761 is 1675122521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172764736 + 1079451025 = 13144^2 + 32855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252215761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252215781) 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, 813416 + ... + 814953.

It is an arithmetic number, because the mean of its divisors is an integer number (313461225).

Almost surely, 2^1252215761 is an apocalyptic number.

It is an amenable number.

1252215761 is a deficient number, since it is larger than the sum of its proper divisors (1629139).

1252215761 is an equidigital number, since it uses as much as digits as its factorization.

1252215761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629138.

The product of its digits is 8400, while the sum is 32.

The square root of 1252215761 is about 35386.6607777564. The cubic root of 1252215761 is about 1077.8534642821.

The spelling of 1252215761 in words is "one billion, two hundred fifty-two million, two hundred fifteen thousand, seven hundred sixty-one".