161632547 has 4 divisors (see below), whose sum is σ = 162216336. Its totient is φ = 161048760.

The previous prime is 161632507. The next prime is 161632553. The reversal of 161632547 is 745236161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745236161 = 109 ⋅6837029.

It is a cyclic number.

It is not a de Polignac number, because 161632547 - 2¹⁸ = 161370403 is a prime.

It is a super-2 number, since 2×161632547² = 52250160499414418, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161632507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291479 + ... + 292032.

It is an arithmetic number, because the mean of its divisors is an integer number (40554084).

Almost surely, 2^161632547 is an apocalyptic number.

161632547 is a deficient number, since it is larger than the sum of its proper divisors (583789).

161632547 is an equidigital number, since it uses as much as digits as its factorization.

161632547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583788.

The product of its digits is 30240, while the sum is 35.

The square root of 161632547 is about 12713.4789495244. The cubic root of 161632547 is about 544.7237013761.

The spelling of 161632547 in words is "one hundred sixty-one million, six hundred thirty-two thousand, five hundred forty-seven".