161301531 has 4 divisors (see below), whose sum is σ = 215068712. Its totient is φ = 107534352.

The previous prime is 161301527. The next prime is 161301551. The reversal of 161301531 is 135103161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161301531 - 2² = 161301527 is a prime.

It is a super-2 number, since 2×161301531² = 52036367805887922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161301498 and 161301507.

It is not an unprimeable number, because it can be changed into a prime (161301521) 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 3 ways as a sum of consecutive naturals, for example, 26883586 + ... + 26883591.

It is an arithmetic number, because the mean of its divisors is an integer number (53767178).

Almost surely, 2^161301531 is an apocalyptic number.

161301531 is a deficient number, since it is larger than the sum of its proper divisors (53767181).

161301531 is an equidigital number, since it uses as much as digits as its factorization.

161301531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53767180.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 161301531 is about 12700.4539682643. The cubic root of 161301531 is about 544.3515909014.

Adding to 161301531 its reverse (135103161), we get a palindrome (296404692).

The spelling of 161301531 in words is "one hundred sixty-one million, three hundred one thousand, five hundred thirty-one".