8161939 has 2 divisors, whose sum is σ = 8161940. Its totient is φ = 8161938.

The previous prime is 8161931. The next prime is 8161943. The reversal of 8161939 is 9391618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8161939 - 2³ = 8161931 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 8161898 and 8161907.

It is not a weakly prime, because it can be changed into another prime (8161931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080969 + 4080970.

It is an arithmetic number, because the mean of its divisors is an integer number (4080970).

Almost surely, 2^8161939 is an apocalyptic number.

8161939 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161939 is an equidigital number, since it uses as much as digits as its factorization.

8161939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 8161939 is about 2856.9107441431. The cubic root of 8161939 is about 201.3404870661.

The spelling of 8161939 in words is "eight million, one hundred sixty-one thousand, nine hundred thirty-nine".