8151961 has 2 divisors, whose sum is σ = 8151962. Its totient is φ = 8151960.

The previous prime is 8151953. The next prime is 8151967. The reversal of 8151961 is 1691518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7617600 + 534361 = 2760^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 8151961 - 2³ = 8151953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8151967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4075980 + 4075981.

It is an arithmetic number, because the mean of its divisors is an integer number (4075981).

Almost surely, 2^8151961 is an apocalyptic number.

It is an amenable number.

8151961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8151961 is an equidigital number, since it uses as much as digits as its factorization.

8151961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 8151961 is about 2855.1639182366. The cubic root of 8151961 is about 201.2584071176.

The spelling of 8151961 in words is "eight million, one hundred fifty-one thousand, nine hundred sixty-one".