867961421 has 2 divisors, whose sum is σ = 867961422. Its totient is φ = 867961420.

The previous prime is 867961417. The next prime is 867961447. The reversal of 867961421 is 124169768.

867961421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626500900 + 241460521 = 25030^2 + 15539^2 .

It is a cyclic number.

It is not a de Polignac number, because 867961421 - 2² = 867961417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (867961481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433980710 + 433980711.

It is an arithmetic number, because the mean of its divisors is an integer number (433980711).

Almost surely, 2^867961421 is an apocalyptic number.

It is an amenable number.

867961421 is a deficient number, since it is larger than the sum of its proper divisors (1).

867961421 is an equidigital number, since it uses as much as digits as its factorization.

867961421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 867961421 is about 29461.1849897454. The cubic root of 867961421 is about 953.8940519213.

The spelling of 867961421 in words is "eight hundred sixty-seven million, nine hundred sixty-one thousand, four hundred twenty-one".