1981922626 has 4 divisors (see below), whose sum is σ = 2972883942. Its totient is φ = 990961312.

The previous prime is 1981922617. The next prime is 1981922629. The reversal of 1981922626 is 6262291891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1584119601 + 397803025 = 39801^2 + 19945^2 .

It is not an unprimeable number, because it can be changed into a prime (1981922629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495480655 + ... + 495480658.

Almost surely, 2^1981922626 is an apocalyptic number.

1981922626 is a deficient number, since it is larger than the sum of its proper divisors (990961316).

1981922626 is an equidigital number, since it uses as much as digits as its factorization.

1981922626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990961315.

The product of its digits is 186624, while the sum is 46.

The square root of 1981922626 is about 44518.7895837252. The cubic root of 1981922626 is about 1256.1135444601.

The spelling of 1981922626 in words is "one billion, nine hundred eighty-one million, nine hundred twenty-two thousand, six hundred twenty-six".