251229012 has 12 divisors (see below), whose sum is σ = 586201056. Its totient is φ = 83743000.

The previous prime is 251229007. The next prime is 251229019. The reversal of 251229012 is 210922152.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×251229012² = 126232032940992288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251229019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10467864 + ... + 10467887.

It is an arithmetic number, because the mean of its divisors is an integer number (48850088).

Almost surely, 2^251229012 is an apocalyptic number.

It is an amenable number.

251229012 is an abundant number, since it is smaller than the sum of its proper divisors (334972044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251229012 is a wasteful number, since it uses less digits than its factorization.

251229012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20935758 (or 20935756 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 251229012 is about 15850.2054245363. The cubic root of 251229012 is about 630.9911433244.

The spelling of 251229012 in words is "two hundred fifty-one million, two hundred twenty-nine thousand, twelve".