1861251 has 16 divisors (see below), whose sum is σ = 2855424. Its totient is φ = 1056384.

The previous prime is 1861219. The next prime is 1861253. The reversal of 1861251 is 1521681.

It is not a de Polignac number, because 1861251 - 2⁵ = 1861219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861253) 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, 5355 + ... + 5691.

It is an arithmetic number, because the mean of its divisors is an integer number (178464).

2^1861251 is an apocalyptic number.

1861251 is a deficient number, since it is larger than the sum of its proper divisors (994173).

1861251 is a wasteful number, since it uses less digits than its factorization.

1861251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its digits is 480, while the sum is 24.

The square root of 1861251 is about 1364.2767314588. The cubic root of 1861251 is about 123.0084599905.

It can be divided in two parts, 1861 and 251, that added together give a palindrome (2112).

The spelling of 1861251 in words is "one million, eight hundred sixty-one thousand, two hundred fifty-one".