251049020 has 12 divisors (see below), whose sum is σ = 527202984. Its totient is φ = 100419600.

The previous prime is 251048983. The next prime is 251049023. The reversal of 251049020 is 20940152.

It is a super-2 number, since 2×251049020² = 126051220885920800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251049023) 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, 6276206 + ... + 6276245.

It is an arithmetic number, because the mean of its divisors is an integer number (43933582).

Almost surely, 2^251049020 is an apocalyptic number.

251049020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251049020 is an abundant number, since it is smaller than the sum of its proper divisors (276153964).

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

251049020 is a wasteful number, since it uses less digits than its factorization.

251049020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12552460 (or 12552458 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 251049020 is about 15844.5264997096. The cubic root of 251049020 is about 630.8404169800.

Adding to 251049020 its reverse (20940152), we get a palindrome (271989172).

The spelling of 251049020 in words is "two hundred fifty-one million, forty-nine thousand, twenty".