32551661 has 4 divisors (see below), whose sum is σ = 32917500. Its totient is φ = 32185824.

The previous prime is 32551639. The next prime is 32551667. The reversal of 32551661 is 16615523.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8236900 + 24314761 = 2870^2 + 4931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32551661 is a prime.

It is a super-2 number, since 2×32551661² = 2119221267717842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32551667) 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, 182786 + ... + 182963.

It is an arithmetic number, because the mean of its divisors is an integer number (8229375).

Almost surely, 2^32551661 is an apocalyptic number.

It is an amenable number.

32551661 is a deficient number, since it is larger than the sum of its proper divisors (365839).

32551661 is an equidigital number, since it uses as much as digits as its factorization.

32551661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365838.

The product of its digits is 5400, while the sum is 29.

The square root of 32551661 is about 5705.4062957865. The cubic root of 32551661 is about 319.2942159691.

The spelling of 32551661 in words is "thirty-two million, five hundred fifty-one thousand, six hundred sixty-one".