1961861 has 4 divisors (see below), whose sum is σ = 2140224. Its totient is φ = 1783500.

The previous prime is 1961857. The next prime is 1961863. The reversal of 1961861 is 1681691.

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.

It is a cyclic number.

It is not a de Polignac number, because 1961861 - 2² = 1961857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961863) 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, 89165 + ... + 89186.

It is an arithmetic number, because the mean of its divisors is an integer number (535056).

2^1961861 is an apocalyptic number.

1961861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1961861 is a deficient number, since it is larger than the sum of its proper divisors (178363).

1961861 is a wasteful number, since it uses less digits than its factorization.

1961861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178362.

The product of its digits is 2592, while the sum is 32.

The square root of 1961861 is about 1400.6644851641. The cubic root of 1961861 is about 125.1860908242.

The spelling of 1961861 in words is "one million, nine hundred sixty-one thousand, eight hundred sixty-one".