161142735 has 32 divisors (see below), whose sum is σ = 278566848. Its totient is φ = 79073280.

The previous prime is 161142731. The next prime is 161142739. The reversal of 161142735 is 537241161.

It is an interprime number because it is at equal distance from previous prime (161142731) and next prime (161142739).

It is not a de Polignac number, because 161142735 - 2² = 161142731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161142731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67665 + ... + 70005.

It is an arithmetic number, because the mean of its divisors is an integer number (8705214).

Almost surely, 2^161142735 is an apocalyptic number.

161142735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161142735 is a deficient number, since it is larger than the sum of its proper divisors (117424113).

161142735 is a wasteful number, since it uses less digits than its factorization.

161142735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715.

The product of its digits is 5040, while the sum is 30.

The square root of 161142735 is about 12694.2008413291. The cubic root of 161142735 is about 544.1729002296.

Adding to 161142735 its reverse (537241161), we get a palindrome (698383896).

The spelling of 161142735 in words is "one hundred sixty-one million, one hundred forty-two thousand, seven hundred thirty-five".