921920837 has 2 divisors, whose sum is σ = 921920838. Its totient is φ = 921920836.

The previous prime is 921920833. The next prime is 921920861. The reversal of 921920837 is 738029129.

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., 894368836 + 27552001 = 29906^2 + 5249^2 .

It is a cyclic number.

It is not a de Polignac number, because 921920837 - 2² = 921920833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921920794 and 921920803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921920833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460960418 + 460960419.

It is an arithmetic number, because the mean of its divisors is an integer number (460960419).

Almost surely, 2^921920837 is an apocalyptic number.

It is an amenable number.

921920837 is a deficient number, since it is larger than the sum of its proper divisors (1).

921920837 is an equidigital number, since it uses as much as digits as its factorization.

921920837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 921920837 is about 30363.1493261157. The cubic root of 921920837 is about 973.2652341667.

The spelling of 921920837 in words is "nine hundred twenty-one million, nine hundred twenty thousand, eight hundred thirty-seven".