161213534 has 8 divisors (see below), whose sum is σ = 242296920. Its totient is φ = 80447896.

The previous prime is 161213527. The next prime is 161213539. The reversal of 161213534 is 435312161.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161213539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78164 + ... + 80199.

It is an arithmetic number, because the mean of its divisors is an integer number (30287115).

Almost surely, 2^161213534 is an apocalyptic number.

161213534 is a deficient number, since it is larger than the sum of its proper divisors (81083386).

161213534 is a wasteful number, since it uses less digits than its factorization.

161213534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158874.

The product of its digits is 2160, while the sum is 26.

The square root of 161213534 is about 12696.9891706656. The cubic root of 161213534 is about 544.2525837396.

Adding to 161213534 its reverse (435312161), we get a palindrome (596525695).

The spelling of 161213534 in words is "one hundred sixty-one million, two hundred thirteen thousand, five hundred thirty-four".