846959921 has 2 divisors, whose sum is σ = 846959922. Its totient is φ = 846959920.

The previous prime is 846959699. The next prime is 846959957. The reversal of 846959921 is 129959648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846519025 + 440896 = 29095^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 846959921 - 2²⁶ = 779851057 is a prime.

It is a super-2 number, since 2×846959921² = 1434682215560652482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (846959221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423479960 + 423479961.

It is an arithmetic number, because the mean of its divisors is an integer number (423479961).

Almost surely, 2^846959921 is an apocalyptic number.

It is an amenable number.

846959921 is a deficient number, since it is larger than the sum of its proper divisors (1).

846959921 is an equidigital number, since it uses as much as digits as its factorization.

846959921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The square root of 846959921 is about 29102.5758481960. The cubic root of 846959921 is about 946.1375664642.

The spelling of 846959921 in words is "eight hundred forty-six million, nine hundred fifty-nine thousand, nine hundred twenty-one".