1151661 has 16 divisors (see below), whose sum is σ = 1770624. Its totient is φ = 652224.

The previous prime is 1151659. The next prime is 1151671. The reversal of 1151661 is 1661511.

It is not a de Polignac number, because 1151661 - 2¹ = 1151659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3475 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (110664).

2^1151661 is an apocalyptic number.

It is an amenable number.

1151661 is a deficient number, since it is larger than the sum of its proper divisors (618963).

1151661 is a wasteful number, since it uses less digits than its factorization.

1151661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its digits is 180, while the sum is 21.

The square root of 1151661 is about 1073.1546952793. The cubic root of 1151661 is about 104.8193719895.

The spelling of 1151661 in words is "one million, one hundred fifty-one thousand, six hundred sixty-one".