1252161005 has 8 divisors (see below), whose sum is σ = 1502868600. Its totient is φ = 1001545216.

The previous prime is 1252160977. The next prime is 1252161019. The reversal of 1252161005 is 5001612521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 309302569 + 942858436 = 17587^2 + 30706^2 .

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 1252161005 - 2⁶ = 1252160941 is a prime.

It is a super-2 number, since 2×1252161005² = 3135814364885220050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11861 + ... + 51429.

It is an arithmetic number, because the mean of its divisors is an integer number (187858575).

Almost surely, 2^1252161005 is an apocalyptic number.

It is an amenable number.

1252161005 is a deficient number, since it is larger than the sum of its proper divisors (250707595).

1252161005 is an equidigital number, since it uses as much as digits as its factorization.

1252161005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45903.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1252161005 is about 35385.8870879338. The cubic root of 1252161005 is about 1077.8377535166.

Adding to 1252161005 its reverse (5001612521), we get a palindrome (6253773526).

The spelling of 1252161005 in words is "one billion, two hundred fifty-two million, one hundred sixty-one thousand, five".