1983902197 has 2 divisors, whose sum is σ = 1983902198. Its totient is φ = 1983902196.

The previous prime is 1983902171. The next prime is 1983902213. The reversal of 1983902197 is 7912093891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012894276 + 971007921 = 31826^2 + 31161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983902197 - 2¹⁵ = 1983869429 is a prime.

It is a super-2 number, since 2×1983902197² = 7871735854522853618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1983902197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983902117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991951098 + 991951099.

It is an arithmetic number, because the mean of its divisors is an integer number (991951099).

Almost surely, 2^1983902197 is an apocalyptic number.

It is an amenable number.

1983902197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983902197 is an equidigital number, since it uses as much as digits as its factorization.

1983902197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 1983902197 is about 44541.0170180251. The cubic root of 1983902197 is about 1256.5316130062.

The spelling of 1983902197 in words is "one billion, nine hundred eighty-three million, nine hundred two thousand, one hundred ninety-seven".