161530777 has 2 divisors, whose sum is σ = 161530778. Its totient is φ = 161530776.

The previous prime is 161530727. The next prime is 161530781. The reversal of 161530777 is 777035161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150896656 + 10634121 = 12284^2 + 3261^2 .

It is a cyclic number.

It is not a de Polignac number, because 161530777 - 2¹⁵ = 161498009 is a prime.

It is not a weakly prime, because it can be changed into another prime (161530717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80765388 + 80765389.

It is an arithmetic number, because the mean of its divisors is an integer number (80765389).

Almost surely, 2^161530777 is an apocalyptic number.

It is an amenable number.

161530777 is a deficient number, since it is larger than the sum of its proper divisors (1).

161530777 is an equidigital number, since it uses as much as digits as its factorization.

161530777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 161530777 is about 12709.4758743231. The cubic root of 161530777 is about 544.6093511185.

The spelling of 161530777 in words is "one hundred sixty-one million, five hundred thirty thousand, seven hundred seventy-seven".