1981347923 has 2 divisors, whose sum is σ = 1981347924. Its totient is φ = 1981347922.

The previous prime is 1981347881. The next prime is 1981347931. The reversal of 1981347923 is 3297431891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1981347923 - 2¹⁸ = 1981085779 is a prime.

It is a super-3 number, since 3×1981347923³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1981347983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990673961 + 990673962.

It is an arithmetic number, because the mean of its divisors is an integer number (990673962).

Almost surely, 2^1981347923 is an apocalyptic number.

1981347923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981347923 is an equidigital number, since it uses as much as digits as its factorization.

1981347923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 1981347923 is about 44512.3345040451. The cubic root of 1981347923 is about 1255.9921199402.

The spelling of 1981347923 in words is "one billion, nine hundred eighty-one million, three hundred forty-seven thousand, nine hundred twenty-three".