1969880921 has 2 divisors, whose sum is σ = 1969880922. Its totient is φ = 1969880920.

The previous prime is 1969880903. The next prime is 1969880953. The reversal of 1969880921 is 1290889691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1895731600 + 74149321 = 43540^2 + 8611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1969880921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1969880971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984940460 + 984940461.

It is an arithmetic number, because the mean of its divisors is an integer number (984940461).

Almost surely, 2^1969880921 is an apocalyptic number.

It is an amenable number.

1969880921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969880921 is an equidigital number, since it uses as much as digits as its factorization.

1969880921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1969880921 is about 44383.3405795463. The cubic root of 1969880921 is about 1253.5644227314.

The spelling of 1969880921 in words is "one billion, nine hundred sixty-nine million, eight hundred eighty thousand, nine hundred twenty-one".