161231435 has 8 divisors (see below), whose sum is σ = 203660880. Its totient is φ = 122196384.

The previous prime is 161231431. The next prime is 161231437. The reversal of 161231435 is 534132161.

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 161231435 - 2² = 161231431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161231431) 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, 848492 + ... + 848681.

It is an arithmetic number, because the mean of its divisors is an integer number (25457610).

Almost surely, 2^161231435 is an apocalyptic number.

161231435 is a deficient number, since it is larger than the sum of its proper divisors (42429445).

161231435 is a wasteful number, since it uses less digits than its factorization.

161231435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697197.

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

The square root of 161231435 is about 12697.6940819977. The cubic root of 161231435 is about 544.2727274266.

Adding to 161231435 its reverse (534132161), we get a palindrome (695363596).

The spelling of 161231435 in words is "one hundred sixty-one million, two hundred thirty-one thousand, four hundred thirty-five".