1551015625 has 16 divisors (see below), whose sum is σ = 1938862224. Its totient is φ = 1240750000.

The previous prime is 1551015623. The next prime is 1551015643. The reversal of 1551015625 is 5265101551.

It can be written as a sum of positive squares in 8 ways, for example, as 934586041 + 616429584 = 30571^2 + 24828^2 .

It is not a de Polignac number, because 1551015625 - 2¹ = 1551015623 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551015623) 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 15 ways as a sum of consecutive naturals, for example, 68199 + ... + 88051.

It is an arithmetic number, because the mean of its divisors is an integer number (121178889).

Almost surely, 2^1551015625 is an apocalyptic number.

It is an amenable number.

1551015625 is a deficient number, since it is larger than the sum of its proper divisors (387846599).

1551015625 is an frugal number, since it uses more digits than its factorization.

1551015625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19888 (or 19858 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The square root of 1551015625 is about 39382.9357082481. The cubic root of 1551015625 is about 1157.5472413767.

The spelling of 1551015625 in words is "one billion, five hundred fifty-one million, fifteen thousand, six hundred twenty-five".