1201861 has 4 divisors (see below), whose sum is σ = 1205824. Its totient is φ = 1197900.

The previous prime is 1201853. The next prime is 1201873. The reversal of 1201861 is 1681021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1681021 = 37 ⋅45433.

It is a 3-Lehmer number, since φ(1201861) divides (1201861-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1201861 - 2³ = 1201853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1485 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (301456).

2^1201861 is an apocalyptic number.

It is an amenable number.

1201861 is a deficient number, since it is larger than the sum of its proper divisors (3963).

1201861 is an equidigital number, since it uses as much as digits as its factorization.

1201861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1201861 is about 1096.2942123354. The cubic root of 1201861 is about 106.3207620895.

Adding to 1201861 its reverse (1681021), we get a palindrome (2882882).

The spelling of 1201861 in words is "one million, two hundred one thousand, eight hundred sixty-one".