161385161531 has 8 divisors (see below), whose sum is σ = 176080014000. Its totient is φ = 146694221440.

The previous prime is 161385161503. The next prime is 161385161563. The reversal of 161385161531 is 135161583161.

161385161531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161385161531 - 2¹⁴ = 161385145147 is a prime.

It is a super-2 number, since 2×161385161531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161385161591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891506 + ... + 1057143.

It is an arithmetic number, because the mean of its divisors is an integer number (22010001750).

Almost surely, 2^161385161531 is an apocalyptic number.

161385161531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161385161531 is a deficient number, since it is larger than the sum of its proper divisors (14694852469).

161385161531 is a wasteful number, since it uses less digits than its factorization.

161385161531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956189.

The product of its digits is 64800, while the sum is 41.

The spelling of 161385161531 in words is "one hundred sixty-one billion, three hundred eighty-five million, one hundred sixty-one thousand, five hundred thirty-one".