2135661 has 8 divisors (see below), whose sum is σ = 3106464. Its totient is φ = 1294320.

The previous prime is 2135641. The next prime is 2135663. The reversal of 2135661 is 1665312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2135661 - 2⁶ = 2135597 is a prime.

It is a super-2 number, since 2×2135661² = 9122095813842, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32326 + ... + 32391.

It is an arithmetic number, because the mean of its divisors is an integer number (388308).

2^2135661 is an apocalyptic number.

It is an amenable number.

2135661 is a deficient number, since it is larger than the sum of its proper divisors (970803).

2135661 is a wasteful number, since it uses less digits than its factorization.

2135661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64731.

The product of its digits is 1080, while the sum is 24.

The square root of 2135661 is about 1461.3900916593. The cubic root of 2135661 is about 128.7787204599.

The spelling of 2135661 in words is "two million, one hundred thirty-five thousand, six hundred sixty-one".