1971149 has 2 divisors, whose sum is σ = 1971150. Its totient is φ = 1971148.

The previous prime is 1971143. The next prime is 1971161. The reversal of 1971149 is 9411791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 94249 = 1370^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971149 - 2¹⁶ = 1905613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985574 + 985575.

It is an arithmetic number, because the mean of its divisors is an integer number (985575).

2^1971149 is an apocalyptic number.

It is an amenable number.

1971149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971149 is an equidigital number, since it uses as much as digits as its factorization.

1971149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 32.

The square root of 1971149 is about 1403.9761393984. The cubic root of 1971149 is about 125.3833352311.

The spelling of 1971149 in words is "one million, nine hundred seventy-one thousand, one hundred forty-nine".