942421891 has 2 divisors, whose sum is σ = 942421892. Its totient is φ = 942421890.

The previous prime is 942421873. The next prime is 942421969. The reversal of 942421891 is 198124249.

It is a weak prime.

It is an emirp because it is prime and its reverse (198124249) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 942421891 - 2⁷ = 942421763 is a prime.

It is not a weakly prime, because it can be changed into another prime (942431891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 471210945 + 471210946.

It is an arithmetic number, because the mean of its divisors is an integer number (471210946).

Almost surely, 2^942421891 is an apocalyptic number.

942421891 is a deficient number, since it is larger than the sum of its proper divisors (1).

942421891 is an equidigital number, since it uses as much as digits as its factorization.

942421891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 942421891 is about 30698.8907128580. The cubic root of 942421891 is about 980.4266818248.

The spelling of 942421891 in words is "nine hundred forty-two million, four hundred twenty-one thousand, eight hundred ninety-one".