1561925 has 6 divisors (see below), whose sum is σ = 1936818. Its totient is φ = 1249520.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561925 is 5291651.

It can be written as a sum of positive squares in 3 ways, for example, as 9409 + 1552516 = 97^2 + 1246^2 .

It is not a de Polignac number, because 1561925 - 2¹⁰ = 1560901 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31214 + ... + 31263.

It is an arithmetic number, because the mean of its divisors is an integer number (322803).

2^1561925 is an apocalyptic number.

It is an amenable number.

1561925 is a deficient number, since it is larger than the sum of its proper divisors (374893).

1561925 is an equidigital number, since it uses as much as digits as its factorization.

1561925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62487 (or 62482 counting only the distinct ones).

The product of its digits is 2700, while the sum is 29.

The square root of 1561925 is about 1249.7699788361. The cubic root of 1561925 is about 116.0254848881.

The spelling of 1561925 in words is "one million, five hundred sixty-one thousand, nine hundred twenty-five".