1021689973 has 2 divisors, whose sum is σ = 1021689974. Its totient is φ = 1021689972.

The previous prime is 1021689943. The next prime is 1021689989. The reversal of 1021689973 is 3799861201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886967524 + 134722449 = 29782^2 + 11607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021689973 - 2⁵ = 1021689941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021689943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510844986 + 510844987.

It is an arithmetic number, because the mean of its divisors is an integer number (510844987).

Almost surely, 2^1021689973 is an apocalyptic number.

It is an amenable number.

1021689973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021689973 is an equidigital number, since it uses as much as digits as its factorization.

1021689973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1021689973 is about 31963.8854490502. The cubic root of 1021689973 is about 1007.1783391506.

The spelling of 1021689973 in words is "one billion, twenty-one million, six hundred eighty-nine thousand, nine hundred seventy-three".