161149777 has 2 divisors, whose sum is σ = 161149778. Its totient is φ = 161149776.

The previous prime is 161149741. The next prime is 161149829. The reversal of 161149777 is 777941161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159794881 + 1354896 = 12641^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 161149777 - 2¹⁵ = 161117009 is a prime.

It is not a weakly prime, because it can be changed into another prime (161129777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80574888 + 80574889.

It is an arithmetic number, because the mean of its divisors is an integer number (80574889).

Almost surely, 2^161149777 is an apocalyptic number.

It is an amenable number.

161149777 is a deficient number, since it is larger than the sum of its proper divisors (1).

161149777 is an equidigital number, since it uses as much as digits as its factorization.

161149777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 43.

The square root of 161149777 is about 12694.4782090482. The cubic root of 161149777 is about 544.1808269697.

The spelling of 161149777 in words is "one hundred sixty-one million, one hundred forty-nine thousand, seven hundred seventy-seven".