161287397 has 2 divisors, whose sum is σ = 161287398. Its totient is φ = 161287396.

The previous prime is 161287393. The next prime is 161287421. The reversal of 161287397 is 793782161.

161287397 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 can be written as a sum of positive squares in only one way, i.e., 161010721 + 276676 = 12689^2 + 526^2 .

It is a cyclic number.

It is not a de Polignac number, because 161287397 - 2² = 161287393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161287393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80643698 + 80643699.

It is an arithmetic number, because the mean of its divisors is an integer number (80643699).

Almost surely, 2^161287397 is an apocalyptic number.

It is an amenable number.

161287397 is a deficient number, since it is larger than the sum of its proper divisors (1).

161287397 is an equidigital number, since it uses as much as digits as its factorization.

161287397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 161287397 is about 12699.8975192716. The cubic root of 161287397 is about 544.3356908867.

The spelling of 161287397 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, three hundred ninety-seven".