981380923 has 2 divisors, whose sum is σ = 981380924. Its totient is φ = 981380922.

The previous prime is 981380903. The next prime is 981380927. The reversal of 981380923 is 329083189.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (329083189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981380923 - 2²⁵ = 947826491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981380923.

It is not a weakly prime, because it can be changed into another prime (981380927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490690461 + 490690462.

It is an arithmetic number, because the mean of its divisors is an integer number (490690462).

Almost surely, 2^981380923 is an apocalyptic number.

981380923 is a deficient number, since it is larger than the sum of its proper divisors (1).

981380923 is an equidigital number, since it uses as much as digits as its factorization.

981380923 is an odious number, because the sum of its binary digits is odd.

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

The square root of 981380923 is about 31326.9999042360. Note that the first 4 decimals coincide. The cubic root of 981380923 is about 993.7547186570.

The spelling of 981380923 in words is "nine hundred eighty-one million, three hundred eighty thousand, nine hundred twenty-three".