161454631 has 4 divisors (see below), whose sum is σ = 173874232. Its totient is φ = 149035032.

The previous prime is 161454619. The next prime is 161454649. The reversal of 161454631 is 136454161.

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

It is a cyclic number.

It is not a de Polignac number, because 161454631 - 2¹¹ = 161452583 is a prime.

It is a super-2 number, since 2×161454631² = 52135195742692322, 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 = 161454593 and 161454602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161454731) 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, 6209781 + ... + 6209806.

It is an arithmetic number, because the mean of its divisors is an integer number (43468558).

Almost surely, 2^161454631 is an apocalyptic number.

161454631 is a deficient number, since it is larger than the sum of its proper divisors (12419601).

161454631 is a wasteful number, since it uses less digits than its factorization.

161454631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12419600.

The product of its digits is 8640, while the sum is 31.

The square root of 161454631 is about 12706.4798823278. The cubic root of 161454631 is about 544.5237609450.

The spelling of 161454631 in words is "one hundred sixty-one million, four hundred fifty-four thousand, six hundred thirty-one".