1561662 has 24 divisors (see below), whose sum is σ = 3421080. Its totient is φ = 514800.

The previous prime is 1561657. The next prime is 1561673. The reversal of 1561662 is 2661651.

It is a happy number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1389 + ... + 2247.

It is an arithmetic number, because the mean of its divisors is an integer number (142545).

2^1561662 is an apocalyptic number.

1561662 is an abundant number, since it is smaller than the sum of its proper divisors (1859418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561662 is a wasteful number, since it uses less digits than its factorization.

1561662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968 (or 965 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1561662 is about 1249.6647550443. The cubic root of 1561662 is about 116.0189723229.

The spelling of 1561662 in words is "one million, five hundred sixty-one thousand, six hundred sixty-two".