161420104031 has 4 divisors (see below), whose sum is σ = 169915899000. Its totient is φ = 152924309064.

The previous prime is 161420104003. The next prime is 161420104033. The reversal of 161420104031 is 130401024161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130401024161 = 271 ⋅481184591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161420104031 is a prime.

It is a super-2 number, since 2×161420104031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161420103988 and 161420104006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161420104033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4247897456 + ... + 4247897493.

It is an arithmetic number, because the mean of its divisors is an integer number (42478974750).

Almost surely, 2^161420104031 is an apocalyptic number.

161420104031 is a deficient number, since it is larger than the sum of its proper divisors (8495794969).

161420104031 is an equidigital number, since it uses as much as digits as its factorization.

161420104031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8495794968.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 161420104031 its reverse (130401024161), we get a palindrome (291821128192).

The spelling of 161420104031 in words is "one hundred sixty-one billion, four hundred twenty million, one hundred four thousand, thirty-one".