161623249 has 2 divisors, whose sum is σ = 161623250. Its totient is φ = 161623248.

The previous prime is 161623247. The next prime is 161623307. The reversal of 161623249 is 942326161.

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., 96530625 + 65092624 = 9825^2 + 8068^2 .

It is a cyclic number.

It is not a de Polignac number, because 161623249 - 2¹ = 161623247 is a prime.

It is a super-2 number, since 2×161623249² = 52244149234632002, which contains 22 as substring.

Together with 161623247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161623247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80811624 + 80811625.

It is an arithmetic number, because the mean of its divisors is an integer number (80811625).

Almost surely, 2^161623249 is an apocalyptic number.

It is an amenable number.

161623249 is a deficient number, since it is larger than the sum of its proper divisors (1).

161623249 is an equidigital number, since it uses as much as digits as its factorization.

161623249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 161623249 is about 12713.1132693766. The cubic root of 161623249 is about 544.7132560002.

The spelling of 161623249 in words is "one hundred sixty-one million, six hundred twenty-three thousand, two hundred forty-nine".