161251147 has 2 divisors, whose sum is σ = 161251148. Its totient is φ = 161251146.

The previous prime is 161251133. The next prime is 161251159. The reversal of 161251147 is 741152161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161251147 - 2¹⁹ = 160726859 is a prime.

It is not a weakly prime, because it can be changed into another prime (161251117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80625573 + 80625574.

It is an arithmetic number, because the mean of its divisors is an integer number (80625574).

Almost surely, 2^161251147 is an apocalyptic number.

161251147 is a deficient number, since it is larger than the sum of its proper divisors (1).

161251147 is an equidigital number, since it uses as much as digits as its factorization.

161251147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 161251147 is about 12698.4702622009. The cubic root of 161251147 is about 544.2949072759.

The spelling of 161251147 in words is "one hundred sixty-one million, two hundred fifty-one thousand, one hundred forty-seven".