921843961 has 2 divisors, whose sum is σ = 921843962. Its totient is φ = 921843960.

The previous prime is 921843953. The next prime is 921843971. The reversal of 921843961 is 169348129.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 808549225 + 113294736 = 28435^2 + 10644^2 .

It is a cyclic number.

It is not a de Polignac number, because 921843961 - 2³ = 921843953 is a prime.

It is not a weakly prime, because it can be changed into another prime (921843941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460921980 + 460921981.

It is an arithmetic number, because the mean of its divisors is an integer number (460921981).

Almost surely, 2^921843961 is an apocalyptic number.

It is an amenable number.

921843961 is a deficient number, since it is larger than the sum of its proper divisors (1).

921843961 is an equidigital number, since it uses as much as digits as its factorization.

921843961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 921843961 is about 30361.8833572623. The cubic root of 921843961 is about 973.2381809336.

The spelling of 921843961 in words is "nine hundred twenty-one million, eight hundred forty-three thousand, nine hundred sixty-one".