1983957149 has 2 divisors, whose sum is σ = 1983957150. Its totient is φ = 1983957148.

The previous prime is 1983957119. The next prime is 1983957163. The reversal of 1983957149 is 9417593891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1261315225 + 722641924 = 35515^2 + 26882^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983957149 - 2²⁴ = 1967179933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1983957094 and 1983957103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983957119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991978574 + 991978575.

It is an arithmetic number, because the mean of its divisors is an integer number (991978575).

Almost surely, 2^1983957149 is an apocalyptic number.

It is an amenable number.

1983957149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983957149 is an equidigital number, since it uses as much as digits as its factorization.

1983957149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 56.

The square root of 1983957149 is about 44541.6338833680. The cubic root of 1983957149 is about 1256.5432144329.

The spelling of 1983957149 in words is "one billion, nine hundred eighty-three million, nine hundred fifty-seven thousand, one hundred forty-nine".