1661552 has 20 divisors (see below), whose sum is σ = 3251280. Its totient is φ = 822528.

The previous prime is 1661549. The next prime is 1661557. The reversal of 1661552 is 2551661.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (162564).

2^1661552 is an apocalyptic number.

It is an amenable number.

1661552 is a deficient number, since it is larger than the sum of its proper divisors (1589728).

1661552 is a wasteful number, since it uses less digits than its factorization.

1661552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1034 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 1661552 is about 1289.0120247694. The cubic root of 1661552 is about 118.4417037167.

The spelling of 1661552 in words is "one million, six hundred sixty-one thousand, five hundred fifty-two".