161619938 has 8 divisors (see below), whose sum is σ = 245498880. Its totient is φ = 79786980.

The previous prime is 161619911. The next prime is 161619943. The reversal of 161619938 is 839916161.

It is a happy number.

161619938 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161619938² = 52242008718247688, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511298 + ... + 511613.

It is an arithmetic number, because the mean of its divisors is an integer number (30687360).

Almost surely, 2^161619938 is an apocalyptic number.

161619938 is a deficient number, since it is larger than the sum of its proper divisors (83878942).

161619938 is a wasteful number, since it uses less digits than its factorization.

161619938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022992.

The product of its digits is 69984, while the sum is 44.

The square root of 161619938 is about 12712.9830488363. The cubic root of 161619938 is about 544.7095363252.

The spelling of 161619938 in words is "one hundred sixty-one million, six hundred nineteen thousand, nine hundred thirty-eight".