161507477 has 2 divisors, whose sum is σ = 161507478. Its totient is φ = 161507476.

The previous prime is 161507447. The next prime is 161507491. The reversal of 161507477 is 774705161.

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., 107205316 + 54302161 = 10354^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 161507477 - 2¹⁴ = 161491093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161507477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161507417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80753738 + 80753739.

It is an arithmetic number, because the mean of its divisors is an integer number (80753739).

Almost surely, 2^161507477 is an apocalyptic number.

It is an amenable number.

161507477 is a deficient number, since it is larger than the sum of its proper divisors (1).

161507477 is an equidigital number, since it uses as much as digits as its factorization.

161507477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 161507477 is about 12708.5592023644. The cubic root of 161507477 is about 544.5831641418.

The spelling of 161507477 in words is "one hundred sixty-one million, five hundred seven thousand, four hundred seventy-seven".