506161391 has 8 divisors (see below), whose sum is σ = 528912384. Its totient is φ = 483472440.

The previous prime is 506161363. The next prime is 506161457. The reversal of 506161391 is 193161605.

It is a happy number.

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 506161391 - 2¹⁰ = 506160367 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 (506161351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586 + ... + 31856.

It is an arithmetic number, because the mean of its divisors is an integer number (66114048).

Almost surely, 2^506161391 is an apocalyptic number.

506161391 is a deficient number, since it is larger than the sum of its proper divisors (22750993).

506161391 is a wasteful number, since it uses less digits than its factorization.

506161391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31021.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 506161391 is about 22498.0308249411. The cubic root of 506161391 is about 796.9474248586.

The spelling of 506161391 in words is "five hundred six million, one hundred sixty-one thousand, three hundred ninety-one".