1561344025 has 6 divisors (see below), whose sum is σ = 1936066622. Its totient is φ = 1249075200.

The previous prime is 1561343941. The next prime is 1561344041. The reversal of 1561344025 is 5204431651.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19289664 + 1542054361 = 4392^2 + 39269^2 .

It is not a de Polignac number, because 1561344025 - 2⁹ = 1561343513 is a prime.

It is a Duffinian 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, 31226856 + ... + 31226905.

Almost surely, 2^1561344025 is an apocalyptic number.

It is an amenable number.

1561344025 is a deficient number, since it is larger than the sum of its proper divisors (374722597).

1561344025 is an equidigital number, since it uses as much as digits as its factorization.

1561344025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62453771 (or 62453766 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1561344025 is about 39513.8459909941. The cubic root of 1561344025 is about 1160.1109745693.

Adding to 1561344025 its reverse (5204431651), we get a palindrome (6765775676).

The spelling of 1561344025 in words is "one billion, five hundred sixty-one million, three hundred forty-four thousand, twenty-five".