1251520216 has 16 divisors (see below), whose sum is σ = 2355526800. Its totient is φ = 623379744.

The previous prime is 1251520169. The next prime is 1251520247. The reversal of 1251520216 is 6120251521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295311 + ... + 299518.

It is an arithmetic number, because the mean of its divisors is an integer number (147220425).

Almost surely, 2^1251520216 is an apocalyptic number.

It is an amenable number.

1251520216 is a deficient number, since it is larger than the sum of its proper divisors (1104006584).

1251520216 is a wasteful number, since it uses less digits than its factorization.

1251520216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595098 (or 595094 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1251520216 is about 35376.8316274932. The cubic root of 1251520216 is about 1077.6538622485.

Adding to 1251520216 its reverse (6120251521), we get a palindrome (7371771737).

The spelling of 1251520216 in words is "one billion, two hundred fifty-one million, five hundred twenty thousand, two hundred sixteen".