163121237 has 2 divisors, whose sum is σ = 163121238. Its totient is φ = 163121236.

The previous prime is 163121219. The next prime is 163121243. The reversal of 163121237 is 732121361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150454756 + 12666481 = 12266^2 + 3559^2 .

It is a cyclic number.

It is not a de Polignac number, because 163121237 - 2¹⁴ = 163104853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163121207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81560618 + 81560619.

It is an arithmetic number, because the mean of its divisors is an integer number (81560619).

Almost surely, 2^163121237 is an apocalyptic number.

It is an amenable number.

163121237 is a deficient number, since it is larger than the sum of its proper divisors (1).

163121237 is an equidigital number, since it uses as much as digits as its factorization.

163121237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 163121237 is about 12771.8924596162. The cubic root of 163121237 is about 546.3909558446.

Adding to 163121237 its reverse (732121361), we get a palindrome (895242598).

The spelling of 163121237 in words is "one hundred sixty-three million, one hundred twenty-one thousand, two hundred thirty-seven".