161338437 has 12 divisors (see below), whose sum is σ = 250971084. Its totient is φ = 99285120.

The previous prime is 161338427. The next prime is 161338459. The reversal of 161338437 is 734833161.

161338437 is a `hidden beast` number, since 1 + 613 + 3 + 8 + 4 + 37 = 666.

161338437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 75794436 + 85544001 = 8706^2 + 9249^2 .

It is not a de Polignac number, because 161338437 - 2¹⁰ = 161337413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161338417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 689364 + ... + 689597.

It is an arithmetic number, because the mean of its divisors is an integer number (20914257).

Almost surely, 2^161338437 is an apocalyptic number.

It is an amenable number.

161338437 is a deficient number, since it is larger than the sum of its proper divisors (89632647).

161338437 is a wasteful number, since it uses less digits than its factorization.

161338437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378980 (or 1378977 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 161338437 is about 12701.9068253550. The cubic root of 161338437 is about 544.3931038527.

The spelling of 161338437 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, four hundred thirty-seven".