1829991997 has 2 divisors, whose sum is σ = 1829991998. Its totient is φ = 1829991996.

The previous prime is 1829991983. The next prime is 1829992027. The reversal of 1829991997 is 7991999281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1783288441 + 46703556 = 42229^2 + 6834^2 .

It is a cyclic number.

It is not a de Polignac number, because 1829991997 - 2¹¹ = 1829989949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1829991497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 914995998 + 914995999.

It is an arithmetic number, because the mean of its divisors is an integer number (914995999).

Almost surely, 2^1829991997 is an apocalyptic number.

It is an amenable number.

1829991997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1829991997 is an equidigital number, since it uses as much as digits as its factorization.

1829991997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 64.

The square root of 1829991997 is about 42778.4057323318. The cubic root of 1829991997 is about 1223.1594176378.

The spelling of 1829991997 in words is "one billion, eight hundred twenty-nine million, nine hundred ninety-one thousand, nine hundred ninety-seven".