161388457 has 2 divisors, whose sum is σ = 161388458. Its totient is φ = 161388456.

The previous prime is 161388443. The next prime is 161388481. The reversal of 161388457 is 754883161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145540096 + 15848361 = 12064^2 + 3981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161388457 is a prime.

It is not a weakly prime, because it can be changed into another prime (161388427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80694228 + 80694229.

It is an arithmetic number, because the mean of its divisors is an integer number (80694229).

Almost surely, 2^161388457 is an apocalyptic number.

It is an amenable number.

161388457 is a deficient number, since it is larger than the sum of its proper divisors (1).

161388457 is an equidigital number, since it uses as much as digits as its factorization.

161388457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 161388457 is about 12703.8756684722. The cubic root of 161388457 is about 544.4493577125.

The spelling of 161388457 in words is "one hundred sixty-one million, three hundred eighty-eight thousand, four hundred fifty-seven".