1561427 has 4 divisors (see below), whose sum is σ = 1784496. Its totient is φ = 1338360.

The previous prime is 1561423. The next prime is 1561429. The reversal of 1561427 is 7241651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7241651 = 281 ⋅25771.

It is a cyclic number.

It is not a de Polignac number, because 1561427 - 2² = 1561423 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1561396 and 1561405.

It is not an unprimeable number, because it can be changed into a prime (1561421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111524 + ... + 111537.

It is an arithmetic number, because the mean of its divisors is an integer number (446124).

2^1561427 is an apocalyptic number.

1561427 is a deficient number, since it is larger than the sum of its proper divisors (223069).

1561427 is an equidigital number, since it uses as much as digits as its factorization.

1561427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223068.

The product of its digits is 1680, while the sum is 26.

The square root of 1561427 is about 1249.5707262896. The cubic root of 1561427 is about 116.0131524920.

The spelling of 1561427 in words is "one million, five hundred sixty-one thousand, four hundred twenty-seven".