1561654 has 16 divisors (see below), whose sum is σ = 2589408. Its totient is φ = 702592.

The previous prime is 1561639. The next prime is 1561657. The reversal of 1561654 is 4561651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 1780.

It is an arithmetic number, because the mean of its divisors is an integer number (161838).

2^1561654 is an apocalyptic number.

1561654 is a deficient number, since it is larger than the sum of its proper divisors (1027754).

1561654 is a wasteful number, since it uses less digits than its factorization.

1561654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039.

The product of its digits is 3600, while the sum is 28.

The square root of 1561654 is about 1249.6615541818. The cubic root of 1561654 is about 116.0187742106.

The spelling of 1561654 in words is "one million, five hundred sixty-one thousand, six hundred fifty-four".