1983216251 has 2 divisors, whose sum is σ = 1983216252. Its totient is φ = 1983216250.

The previous prime is 1983216241. The next prime is 1983216259. The reversal of 1983216251 is 1526123891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1983216251 - 2⁶ = 1983216187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1983216259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991608125 + 991608126.

It is an arithmetic number, because the mean of its divisors is an integer number (991608126).

Almost surely, 2^1983216251 is an apocalyptic number.

1983216251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983216251 is an equidigital number, since it uses as much as digits as its factorization.

1983216251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 1983216251 is about 44533.3161913640. The cubic root of 1983216251 is about 1256.3867785496.

The spelling of 1983216251 in words is "one billion, nine hundred eighty-three million, two hundred sixteen thousand, two hundred fifty-one".