1601155 has 8 divisors (see below), whose sum is σ = 1933200. Its totient is φ = 1273056.

The previous prime is 1601147. The next prime is 1601161. The reversal of 1601155 is 5511061.

1601155 is a nontrivial binomial coefficient, being equal to C(1790, 2).

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

It is a cyclic number.

It is not a de Polignac number, because 1601155 - 2³ = 1601147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 1789.

It is an arithmetic number, because the mean of its divisors is an integer number (241650).

2^1601155 is an apocalyptic number.

1601155 is the 1789-th triangular number and also the 895-th hexagonal number.

1601155 is the 597-th centered nonagonal number.

1601155 is a deficient number, since it is larger than the sum of its proper divisors (332045).

1601155 is a wasteful number, since it uses less digits than its factorization.

1601155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1601155 is about 1265.3675355406. The cubic root of 1601155 is about 116.9888464299.

It can be divided in two parts, 1 and 601155, that added together give a triangular number (601156 = T₁₀₉₆).

The spelling of 1601155 in words is "one million, six hundred one thousand, one hundred fifty-five".