1634661 has 36 divisors (see below), whose sum is σ = 2891616. Its totient is φ = 903960.

The previous prime is 1634657. The next prime is 1634681. The reversal of 1634661 is 1664361.

It is not a de Polignac number, because 1634661 - 2² = 1634657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 52716 + ... + 52746.

2^1634661 is an apocalyptic number.

It is an amenable number.

1634661 is a deficient number, since it is larger than the sum of its proper divisors (1256955).

1634661 is an frugal number, since it uses more digits than its factorization.

1634661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 41 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1634661 is about 1278.5386188927. The cubic root of 1634661 is about 117.7992613065.

The spelling of 1634661 in words is "one million, six hundred thirty-four thousand, six hundred sixty-one".