161481637 has 2 divisors, whose sum is σ = 161481638. Its totient is φ = 161481636.

The previous prime is 161481629. The next prime is 161481679. The reversal of 161481637 is 736184161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124344801 + 37136836 = 11151^2 + 6094^2 .

It is a cyclic number.

It is not a de Polignac number, because 161481637 - 2³ = 161481629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161481596 and 161481605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161481337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80740818 + 80740819.

It is an arithmetic number, because the mean of its divisors is an integer number (80740819).

Almost surely, 2^161481637 is an apocalyptic number.

It is an amenable number.

161481637 is a deficient number, since it is larger than the sum of its proper divisors (1).

161481637 is an equidigital number, since it uses as much as digits as its factorization.

161481637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 161481637 is about 12707.5425240288. The cubic root of 161481637 is about 544.5541195020.

The spelling of 161481637 in words is "one hundred sixty-one million, four hundred eighty-one thousand, six hundred thirty-seven".