1561534 has 32 divisors (see below), whose sum is σ = 2772000. Its totient is φ = 653184.

The previous prime is 1561529. The next prime is 1561537. The reversal of 1561534 is 4351651.

It is a junction number, because it is equal to n+sod(n) for n = 1561499 and 1561508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14272 + ... + 14380.

It is an arithmetic number, because the mean of its divisors is an integer number (86625).

2^1561534 is an apocalyptic number.

1561534 is a deficient number, since it is larger than the sum of its proper divisors (1210466).

1561534 is a wasteful number, since it uses less digits than its factorization.

1561534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its digits is 1800, while the sum is 25.

The square root of 1561534 is about 1249.6135402595. The cubic root of 1561534 is about 116.0158024449.

The spelling of 1561534 in words is "one million, five hundred sixty-one thousand, five hundred thirty-four".