161651838 has 32 divisors (see below), whose sum is σ = 329304960. Its totient is φ = 52889760.

The previous prime is 161651821. The next prime is 161651839. The reversal of 161651838 is 838156161.

161651838 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161651838² = 52262633457556488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161651796 and 161651805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161651839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151828 + ... + 152888.

It is an arithmetic number, because the mean of its divisors is an integer number (10290780).

Almost surely, 2^161651838 is an apocalyptic number.

161651838 is an abundant number, since it is smaller than the sum of its proper divisors (167653122).

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

161651838 is a wasteful number, since it uses less digits than its factorization.

161651838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512.

The product of its digits is 34560, while the sum is 39.

The square root of 161651838 is about 12714.2376098608. The cubic root of 161651838 is about 544.7453716133.

The spelling of 161651838 in words is "one hundred sixty-one million, six hundred fifty-one thousand, eight hundred thirty-eight".