1251613245 has 16 divisors (see below), whose sum is σ = 2056705920. Its totient is φ = 649485504.

The previous prime is 1251613217. The next prime is 1251613247. The reversal of 1251613245 is 5423161521.

It is not a de Polignac number, because 1251613245 - 2¹⁰ = 1251612221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251613247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1127025 + ... + 1128134.

It is an arithmetic number, because the mean of its divisors is an integer number (128544120).

Almost surely, 2^1251613245 is an apocalyptic number.

1251613245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251613245 is a deficient number, since it is larger than the sum of its proper divisors (805092675).

1251613245 is a wasteful number, since it uses less digits than its factorization.

1251613245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255204.

The product of its digits is 7200, while the sum is 30.

The square root of 1251613245 is about 35378.1464325083. The cubic root of 1251613245 is about 1077.6805632627.

Adding to 1251613245 its reverse (5423161521), we get a palindrome (6674774766).

The spelling of 1251613245 in words is "one billion, two hundred fifty-one million, six hundred thirteen thousand, two hundred forty-five".