1997129 has 2 divisors, whose sum is σ = 1997130. Its totient is φ = 1997128.

The previous prime is 1997119. The next prime is 1997137. The reversal of 1997129 is 9217991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 23104 = 1405^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997129 - 2¹⁶ = 1931593 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1997092 and 1997101.

It is not a weakly prime, because it can be changed into another prime (1997119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998564 + 998565.

It is an arithmetic number, because the mean of its divisors is an integer number (998565).

2^1997129 is an apocalyptic number.

It is an amenable number.

1997129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997129 is an equidigital number, since it uses as much as digits as its factorization.

1997129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 38.

The square root of 1997129 is about 1413.1981460503. The cubic root of 1997129 is about 125.9317888968.

The spelling of 1997129 in words is "one million, nine hundred ninety-seven thousand, one hundred twenty-nine".