161472637 has 4 divisors (see below), whose sum is σ = 165411036. Its totient is φ = 157534240.

The previous prime is 161472617. The next prime is 161472643. The reversal of 161472637 is 736274161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25190361 + 136282276 = 5019^2 + 11674^2 .

It is a cyclic number.

It is not a de Polignac number, because 161472637 - 2¹⁵ = 161439869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161472596 and 161472605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161472607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969138 + ... + 1969219.

It is an arithmetic number, because the mean of its divisors is an integer number (41352759).

Almost surely, 2^161472637 is an apocalyptic number.

It is an amenable number.

161472637 is a deficient number, since it is larger than the sum of its proper divisors (3938399).

161472637 is an equidigital number, since it uses as much as digits as its factorization.

161472637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938398.

The product of its digits is 42336, while the sum is 37.

The square root of 161472637 is about 12707.1883986978. The cubic root of 161472637 is about 544.5440026074.

The spelling of 161472637 in words is "one hundred sixty-one million, four hundred seventy-two thousand, six hundred thirty-seven".