161979550 has 12 divisors (see below), whose sum is σ = 301282056. Its totient is φ = 64791800.

The previous prime is 161979523. The next prime is 161979577. The reversal of 161979550 is 55979161.

It is an interprime number because it is at equal distance from previous prime (161979523) and next prime (161979577).

It is a junction number, because it is equal to n+sod(n) for n = 161979497 and 161979506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1619746 + ... + 1619845.

It is an arithmetic number, because the mean of its divisors is an integer number (25106838).

Almost surely, 2^161979550 is an apocalyptic number.

161979550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161979550 is a deficient number, since it is larger than the sum of its proper divisors (139302506).

161979550 is a wasteful number, since it uses less digits than its factorization.

161979550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239603 (or 3239598 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 161979550 is about 12727.1186841327. The cubic root of 161979550 is about 545.1132385411.

The spelling of 161979550 in words is "one hundred sixty-one million, nine hundred seventy-nine thousand, five hundred fifty".