6121861 has 2 divisors, whose sum is σ = 6121862. Its totient is φ = 6121860.

The previous prime is 6121847. The next prime is 6121873. The reversal of 6121861 is 1681216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 390625 = 2394^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 6121861 - 2⁷ = 6121733 is a prime.

6121861 is a lucky number.

It is equal to p₄₂₀₆₄₉ and since 6121861 and 420649 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6121261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3060930 + 3060931.

It is an arithmetic number, because the mean of its divisors is an integer number (3060931).

Almost surely, 2^6121861 is an apocalyptic number.

It is an amenable number.

6121861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6121861 is an equidigital number, since it uses as much as digits as its factorization.

6121861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 6121861 is about 2474.2394791127. The cubic root of 6121861 is about 182.9340242129.

The spelling of 6121861 in words is "six million, one hundred twenty-one thousand, eight hundred sixty-one".