161019377 has 2 divisors, whose sum is σ = 161019378. Its totient is φ = 161019376.

The previous prime is 161019373. The next prime is 161019421. The reversal of 161019377 is 773910161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113188321 + 47831056 = 10639^2 + 6916^2 .

It is a cyclic number.

It is not a de Polignac number, because 161019377 - 2² = 161019373 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161019371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80509688 + 80509689.

It is an arithmetic number, because the mean of its divisors is an integer number (80509689).

Almost surely, 2^161019377 is an apocalyptic number.

It is an amenable number.

161019377 is a deficient number, since it is larger than the sum of its proper divisors (1).

161019377 is an equidigital number, since it uses as much as digits as its factorization.

161019377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 161019377 is about 12689.3410782436. The cubic root of 161019377 is about 544.0340063535.

The spelling of 161019377 in words is "one hundred sixty-one million, nineteen thousand, three hundred seventy-seven".