1251520450 has 48 divisors (see below), whose sum is σ = 2469678984. Its totient is φ = 470220800.

The previous prime is 1251520427. The next prime is 1251520483. The reversal of 1251520450 is 540251521.

It can be written as a sum of positive squares in 12 ways, for example, as 419717169 + 831803281 = 20487^2 + 28841^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 543702 + ... + 545998.

Almost surely, 2^1251520450 is an apocalyptic number.

1251520450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251520450 is a deficient number, since it is larger than the sum of its proper divisors (1218158534).

1251520450 is a wasteful number, since it uses less digits than its factorization.

1251520450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967 (or 2962 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1251520450 is about 35376.8349347423. The cubic root of 1251520450 is about 1077.6539294124.

Adding to 1251520450 its reverse (540251521), we get a palindrome (1791771971).

The spelling of 1251520450 in words is "one billion, two hundred fifty-one million, five hundred twenty thousand, four hundred fifty".