1251265213 has 16 divisors (see below), whose sum is σ = 1400610816. Its totient is φ = 1107998640.

The previous prime is 1251265207. The next prime is 1251265219. The reversal of 1251265213 is 3125621521.

It is an interprime number because it is at equal distance from previous prime (1251265207) and next prime (1251265219).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251265213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251265219) 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, 177706 + ... + 184612.

It is an arithmetic number, because the mean of its divisors is an integer number (87538176).

Almost surely, 2^1251265213 is an apocalyptic number.

It is an amenable number.

1251265213 is a deficient number, since it is larger than the sum of its proper divisors (149345603).

1251265213 is a wasteful number, since it uses less digits than its factorization.

1251265213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344.

The product of its digits is 3600, while the sum is 28.

The square root of 1251265213 is about 35373.2273478121. The cubic root of 1251265213 is about 1077.5806649666.

Adding to 1251265213 its reverse (3125621521), we get a palindrome (4376886734).

The spelling of 1251265213 in words is "one billion, two hundred fifty-one million, two hundred sixty-five thousand, two hundred thirteen".