161456749 has 2 divisors, whose sum is σ = 161456750. Its totient is φ = 161456748.

The previous prime is 161456741. The next prime is 161456753. The reversal of 161456749 is 947654161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96138025 + 65318724 = 9805^2 + 8082^2 .

It is an emirp because it is prime and its reverse (947654161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161456749 - 2³ = 161456741 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161456741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80728374 + 80728375.

It is an arithmetic number, because the mean of its divisors is an integer number (80728375).

Almost surely, 2^161456749 is an apocalyptic number.

It is an amenable number.

161456749 is a deficient number, since it is larger than the sum of its proper divisors (1).

161456749 is an equidigital number, since it uses as much as digits as its factorization.

161456749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 161456749 is about 12706.5632253572. The cubic root of 161456749 is about 544.5261419984.

The spelling of 161456749 in words is "one hundred sixty-one million, four hundred fifty-six thousand, seven hundred forty-nine".