251304013 has 12 divisors (see below), whose sum is σ = 280835100. Its totient is φ = 224067456.

The previous prime is 251303999. The next prime is 251304017. The reversal of 251304013 is 310403152.

It can be written as a sum of positive squares in 2 ways, for example, as 156300004 + 95004009 = 12502^2 + 9747^2 .

It is not a de Polignac number, because 251304013 - 2¹⁷ = 251172941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251304017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14338 + ... + 26611.

It is an arithmetic number, because the mean of its divisors is an integer number (23402925).

Almost surely, 2^251304013 is an apocalyptic number.

It is an amenable number.

251304013 is a deficient number, since it is larger than the sum of its proper divisors (29531087).

251304013 is a wasteful number, since it uses less digits than its factorization.

251304013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41004 (or 40985 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 251304013 is about 15852.5711794649. The cubic root of 251304013 is about 631.0539283477.

Adding to 251304013 its reverse (310403152), we get a palindrome (561707165).

The spelling of 251304013 in words is "two hundred fifty-one million, three hundred four thousand, thirteen".