161049761 has 4 divisors (see below), whose sum is σ = 161432724. Its totient is φ = 160666800.

The previous prime is 161049737. The next prime is 161049767. The reversal of 161049761 is 167940161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19891600 + 141158161 = 4460^2 + 11881^2 .

It is a cyclic number.

It is not a de Polignac number, because 161049761 - 2¹⁴ = 161033377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161049767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190850 + ... + 191691.

It is an arithmetic number, because the mean of its divisors is an integer number (40358181).

Almost surely, 2^161049761 is an apocalyptic number.

It is an amenable number.

161049761 is a deficient number, since it is larger than the sum of its proper divisors (382963).

161049761 is an equidigital number, since it uses as much as digits as its factorization.

161049761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382962.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 161049761 is about 12690.5382470563. The cubic root of 161049761 is about 544.0682235389.

The spelling of 161049761 in words is "one hundred sixty-one million, forty-nine thousand, seven hundred sixty-one".