161869637 has 2 divisors, whose sum is σ = 161869638. Its totient is φ = 161869636.

The previous prime is 161869633. The next prime is 161869703. The reversal of 161869637 is 736968161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161823841 + 45796 = 12721^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 161869637 - 2² = 161869633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161869591 and 161869600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161869633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80934818 + 80934819.

It is an arithmetic number, because the mean of its divisors is an integer number (80934819).

Almost surely, 2^161869637 is an apocalyptic number.

It is an amenable number.

161869637 is a deficient number, since it is larger than the sum of its proper divisors (1).

161869637 is an equidigital number, since it uses as much as digits as its factorization.

161869637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 161869637 is about 12722.7998883893. The cubic root of 161869637 is about 544.9899131203.

The spelling of 161869637 in words is "one hundred sixty-one million, eight hundred sixty-nine thousand, six hundred thirty-seven".