1561552325 has 6 divisors (see below), whose sum is σ = 1936324914. Its totient is φ = 1249241840.

The previous prime is 1561552319. The next prime is 1561552327. The reversal of 1561552325 is 5232551651.

It can be written as a sum of positive squares in 3 ways, for example, as 12264004 + 1549288321 = 3502^2 + 39361^2 .

It is not a de Polignac number, because 1561552325 - 2¹⁶ = 1561486789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561552327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31231022 + ... + 31231071.

It is an arithmetic number, because the mean of its divisors is an integer number (322720819).

Almost surely, 2^1561552325 is an apocalyptic number.

It is an amenable number.

1561552325 is a deficient number, since it is larger than the sum of its proper divisors (374772589).

1561552325 is an equidigital number, since it uses as much as digits as its factorization.

1561552325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62462103 (or 62462098 counting only the distinct ones).

The product of its digits is 45000, while the sum is 35.

The square root of 1561552325 is about 39516.4816880248. The cubic root of 1561552325 is about 1160.1625626811.

The spelling of 1561552325 in words is "one billion, five hundred sixty-one million, five hundred fifty-two thousand, three hundred twenty-five".