161284997 has 2 divisors, whose sum is σ = 161284998. Its totient is φ = 161284996.

The previous prime is 161284957. The next prime is 161285017. The reversal of 161284997 is 799482161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101082916 + 60202081 = 10054^2 + 7759^2 .

It is an emirp because it is prime and its reverse (799482161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161284997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161284927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80642498 + 80642499.

It is an arithmetic number, because the mean of its divisors is an integer number (80642499).

Almost surely, 2^161284997 is an apocalyptic number.

It is an amenable number.

161284997 is a deficient number, since it is larger than the sum of its proper divisors (1).

161284997 is an equidigital number, since it uses as much as digits as its factorization.

161284997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 161284997 is about 12699.8030299686. The cubic root of 161284997 is about 544.3329909193.

The spelling of 161284997 in words is "one hundred sixty-one million, two hundred eighty-four thousand, nine hundred ninety-seven".