1491665 has 32 divisors (see below), whose sum is σ = 2280960. Its totient is φ = 912384.

The previous prime is 1491661. The next prime is 1491667. The reversal of 1491665 is 5661941.

It is a cyclic number.

It is not a de Polignac number, because 1491665 - 2² = 1491661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13631 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2^1491665 is an apocalyptic number.

It is an amenable number.

1491665 is a deficient number, since it is larger than the sum of its proper divisors (789295).

1491665 is a wasteful number, since it uses less digits than its factorization.

1491665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

The product of its digits is 6480, while the sum is 32.

The square root of 1491665 is about 1221.3373817255. The cubic root of 1491665 is about 114.2590038024.

The spelling of 1491665 in words is "one million, four hundred ninety-one thousand, six hundred sixty-five".