1861051 has 4 divisors (see below), whose sum is σ = 1878552. Its totient is φ = 1843552.

The previous prime is 1861039. The next prime is 1861061. The reversal of 1861051 is 1501681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1861051 - 2⁵ = 1861019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8590 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (469638).

2^1861051 is an apocalyptic number.

1861051 is a deficient number, since it is larger than the sum of its proper divisors (17501).

1861051 is a wasteful number, since it uses less digits than its factorization.

1861051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1861051 is about 1364.2034305777. The cubic root of 1861051 is about 123.0040538907.

The spelling of 1861051 in words is "one million, eight hundred sixty-one thousand, fifty-one".