1561042 has 24 divisors (see below), whose sum is σ = 2887164. Its totient is φ = 628992.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561042 is 2401651.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 25921 = 1239^2 + 161^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1198 + ... + 2134.

2^1561042 is an apocalyptic number.

1561042 is a deficient number, since it is larger than the sum of its proper divisors (1326122).

1561042 is a wasteful number, since it uses less digits than its factorization.

1561042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1561042 is about 1249.4166638876. The cubic root of 1561042 is about 116.0036166134.

Adding to 1561042 its reverse (2401651), we get a palindrome (3962693).

The spelling of 1561042 in words is "one million, five hundred sixty-one thousand, forty-two".