1252217409 has 4 divisors (see below), whose sum is σ = 1669623216. Its totient is φ = 834811604.

The previous prime is 1252217383. The next prime is 1252217413. The reversal of 1252217409 is 9047122521.

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.

It is a cyclic number.

It is not a de Polignac number, because 1252217409 - 2⁵ = 1252217377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1252217409.

It is not an unprimeable number, because it can be changed into a prime (1252217459) 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, 208702899 + ... + 208702904.

It is an arithmetic number, because the mean of its divisors is an integer number (417405804).

Almost surely, 2^1252217409 is an apocalyptic number.

It is an amenable number.

1252217409 is a deficient number, since it is larger than the sum of its proper divisors (417405807).

1252217409 is an equidigital number, since it uses as much as digits as its factorization.

1252217409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417405806.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1252217409 is about 35386.6840633592. The cubic root of 1252217409 is about 1077.8539371244.

The spelling of 1252217409 in words is "one billion, two hundred fifty-two million, two hundred seventeen thousand, four hundred nine".