161210947 has 2 divisors, whose sum is σ = 161210948. Its totient is φ = 161210946.

The previous prime is 161210941. The next prime is 161211007. The reversal of 161210947 is 749012161.

161210947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (749012161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161210947 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (161210941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80605473 + 80605474.

It is an arithmetic number, because the mean of its divisors is an integer number (80605474).

Almost surely, 2^161210947 is an apocalyptic number.

161210947 is a deficient number, since it is larger than the sum of its proper divisors (1).

161210947 is an equidigital number, since it uses as much as digits as its factorization.

161210947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 161210947 is about 12696.8872957115. The cubic root of 161210947 is about 544.2496725097.

The spelling of 161210947 in words is "one hundred sixty-one million, two hundred ten thousand, nine hundred forty-seven".