161408031 has 4 divisors (see below), whose sum is σ = 215210712. Its totient is φ = 107605352.

The previous prime is 161408029. The next prime is 161408033. The reversal of 161408031 is 130804161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130804161 = 3 ⋅43601387.

It is an interprime number because it is at equal distance from previous prime (161408029) and next prime (161408033).

It is a cyclic number.

It is not a de Polignac number, because 161408031 - 2¹ = 161408029 is a prime.

It is a super-2 number, since 2×161408031² = 52105104942593922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161407992 and 161408010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161408033) 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, 26901336 + ... + 26901341.

It is an arithmetic number, because the mean of its divisors is an integer number (53802678).

Almost surely, 2^161408031 is an apocalyptic number.

161408031 is a deficient number, since it is larger than the sum of its proper divisors (53802681).

161408031 is an equidigital number, since it uses as much as digits as its factorization.

161408031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53802680.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 161408031 is about 12704.6460399336. The cubic root of 161408031 is about 544.4713680039.

The spelling of 161408031 in words is "one hundred sixty-one million, four hundred eight thousand, thirty-one".