161338947 has 16 divisors (see below), whose sum is σ = 268200192. Its totient is φ = 83812320.

The previous prime is 161338901. The next prime is 161339021. The reversal of 161338947 is 749833161.

It is not a de Polignac number, because 161338947 - 2¹⁰ = 161337923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161338899 and 161338908.

It is not an unprimeable number, because it can be changed into a prime (161338147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348988 + ... + 349449.

It is an arithmetic number, because the mean of its divisors is an integer number (16762512).

Almost surely, 2^161338947 is an apocalyptic number.

161338947 is a deficient number, since it is larger than the sum of its proper divisors (106861245).

161338947 is a wasteful number, since it uses less digits than its factorization.

161338947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698458.

The product of its digits is 108864, while the sum is 42.

The square root of 161338947 is about 12701.9269010651. The cubic root of 161338947 is about 544.3936774713.

The spelling of 161338947 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, nine hundred forty-seven".