861954059 has 2 divisors, whose sum is σ = 861954060. Its totient is φ = 861954058.

The previous prime is 861954017. The next prime is 861954061. The reversal of 861954059 is 950459168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861954059 - 2⁸ = 861953803 is a prime.

It is a Sophie Germain prime.

Together with 861954061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (861954959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430977029 + 430977030.

It is an arithmetic number, because the mean of its divisors is an integer number (430977030).

Almost surely, 2^861954059 is an apocalyptic number.

861954059 is a deficient number, since it is larger than the sum of its proper divisors (1).

861954059 is an equidigital number, since it uses as much as digits as its factorization.

861954059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 861954059 is about 29359.0541230469. The cubic root of 861954059 is about 951.6882478938.

The spelling of 861954059 in words is "eight hundred sixty-one million, nine hundred fifty-four thousand, fifty-nine".