161759551 has 8 divisors (see below), whose sum is σ = 165531600. Its totient is φ = 158014272.

The previous prime is 161759537. The next prime is 161759557. The reversal of 161759551 is 155957161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161759551 - 2¹⁷ = 161628479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161759557) 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 7 ways as a sum of consecutive naturals, for example, 5800 + ... + 18898.

It is an arithmetic number, because the mean of its divisors is an integer number (20691450).

Almost surely, 2^161759551 is an apocalyptic number.

161759551 is a deficient number, since it is larger than the sum of its proper divisors (3772049).

161759551 is a wasteful number, since it uses less digits than its factorization.

161759551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13385.

The product of its digits is 47250, while the sum is 40.

The square root of 161759551 is about 12718.4728249896. The cubic root of 161759551 is about 544.8663376170.

The spelling of 161759551 in words is "one hundred sixty-one million, seven hundred fifty-nine thousand, five hundred fifty-one".