1561466 has 4 divisors (see below), whose sum is σ = 2342202. Its totient is φ = 780732.

The previous prime is 1561463. The next prime is 1561499. The reversal of 1561466 is 6641651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 687241 = 935^2 + 829^2 .

It is not an unprimeable number, because it can be changed into a prime (1561463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390365 + ... + 390368.

2^1561466 is an apocalyptic number.

1561466 is a deficient number, since it is larger than the sum of its proper divisors (780736).

1561466 is an equidigital number, since it uses as much as digits as its factorization.

1561466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780735.

The product of its digits is 4320, while the sum is 29.

The square root of 1561466 is about 1249.5863315514. The cubic root of 1561466 is about 116.0141183767.

The spelling of 1561466 in words is "one million, five hundred sixty-one thousand, four hundred sixty-six".