161917902 has 24 divisors (see below), whose sum is σ = 351064584. Its totient is φ = 53935344.

The previous prime is 161917901. The next prime is 161917909. The reversal of 161917902 is 209719161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161917901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39313 + ... + 43235.

It is an arithmetic number, because the mean of its divisors is an integer number (14627691).

Almost surely, 2^161917902 is an apocalyptic number.

161917902 is an abundant number, since it is smaller than the sum of its proper divisors (189146682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161917902 is a wasteful number, since it uses less digits than its factorization.

161917902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6224 (or 6221 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 161917902 is about 12724.6965386213. The cubic root of 161917902 is about 545.0440746557.

The spelling of 161917902 in words is "one hundred sixty-one million, nine hundred seventeen thousand, nine hundred two".