1561142 has 12 divisors (see below), whose sum is σ = 2574348. Its totient is φ = 709500.

The previous prime is 1561139. The next prime is 1561151. The reversal of 1561142 is 2411651.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

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, 2984 + ... + 3467.

It is an arithmetic number, because the mean of its divisors is an integer number (214529).

2^1561142 is an apocalyptic number.

1561142 is a deficient number, since it is larger than the sum of its proper divisors (1013206).

1561142 is a wasteful number, since it uses less digits than its factorization.

1561142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475 (or 6464 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 1561142 is about 1249.4566819222. The cubic root of 1561142 is about 116.0060936157.

Adding to 1561142 its reverse (2411651), we get a palindrome (3972793).

The spelling of 1561142 in words is "one million, five hundred sixty-one thousand, one hundred forty-two".