1951861 has 8 divisors (see below), whose sum is σ = 2035584. Its totient is φ = 1869840.

The previous prime is 1951843. The next prime is 1951867. The reversal of 1951861 is 1681591.

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 1951861 - 2¹¹ = 1949813 is a prime.

It is a super-2 number, since 2×1951861² = 7619522726642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2256 + ... + 2998.

It is an arithmetic number, because the mean of its divisors is an integer number (254448).

2^1951861 is an apocalyptic number.

It is an amenable number.

1951861 is a deficient number, since it is larger than the sum of its proper divisors (83723).

1951861 is an equidigital number, since it uses as much as digits as its factorization.

1951861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851.

The product of its digits is 2160, while the sum is 31.

The square root of 1951861 is about 1397.0901903599. The cubic root of 1951861 is about 124.9730288475.

The spelling of 1951861 in words is "one million, nine hundred fifty-one thousand, eight hundred sixty-one".