1561442 has 4 divisors (see below), whose sum is σ = 2342166. Its totient is φ = 780720.

The previous prime is 1561429. The next prime is 1561453. The reversal of 1561442 is 2441651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2441651 = 367 ⋅6653.

It can be written as a sum of positive squares in only one way, i.e., 1100401 + 461041 = 1049^2 + 679^2 .

It is a super-2 number, since 2×1561442² = 4876202238728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390359 + ... + 390362.

2^1561442 is an apocalyptic number.

1561442 is a deficient number, since it is larger than the sum of its proper divisors (780724).

1561442 is an equidigital number, since it uses as much as digits as its factorization.

1561442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780723.

The product of its digits is 960, while the sum is 23.

The square root of 1561442 is about 1249.5767283364. The cubic root of 1561442 is about 116.0135239880.

The spelling of 1561442 in words is "one million, five hundred sixty-one thousand, four hundred forty-two".