1972351321 has 2 divisors, whose sum is σ = 1972351322. Its totient is φ = 1972351320.

The previous prime is 1972351313. The next prime is 1972351333. The reversal of 1972351321 is 1231532791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1972336921 + 14400 = 44411^2 + 120^2 .

It is an emirp because it is prime and its reverse (1231532791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1972351321 - 2³ = 1972351313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972351301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986175660 + 986175661.

It is an arithmetic number, because the mean of its divisors is an integer number (986175661).

Almost surely, 2^1972351321 is an apocalyptic number.

It is an amenable number.

1972351321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972351321 is an equidigital number, since it uses as much as digits as its factorization.

1972351321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 1972351321 is about 44411.1621217009. The cubic root of 1972351321 is about 1254.0882296723.

The spelling of 1972351321 in words is "one billion, nine hundred seventy-two million, three hundred fifty-one thousand, three hundred twenty-one".