161158649 has 2 divisors, whose sum is σ = 161158650. Its totient is φ = 161158648.

The previous prime is 161158609. The next prime is 161158661. The reversal of 161158649 is 946851161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101868649 + 59290000 = 10093^2 + 7700^2 .

It is an emirp because it is prime and its reverse (946851161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161158649 - 2¹⁶ = 161093113 is a prime.

It is a super-2 number, since 2×161158649² = 51944220295010402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161158609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80579324 + 80579325.

It is an arithmetic number, because the mean of its divisors is an integer number (80579325).

Almost surely, 2^161158649 is an apocalyptic number.

It is an amenable number.

161158649 is a deficient number, since it is larger than the sum of its proper divisors (1).

161158649 is an equidigital number, since it uses as much as digits as its factorization.

161158649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 161158649 is about 12694.8276475106. The cubic root of 161158649 is about 544.1908132979.

The spelling of 161158649 in words is "one hundred sixty-one million, one hundred fifty-eight thousand, six hundred forty-nine".