161551026 has 48 divisors (see below), whose sum is σ = 430807104. Its totient is φ = 42606432.

The previous prime is 161551021. The next prime is 161551037. The reversal of 161551026 is 620155161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161551021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47676 + ... + 50951.

It is an arithmetic number, because the mean of its divisors is an integer number (8975148).

Almost surely, 2^161551026 is an apocalyptic number.

161551026 is an abundant number, since it is smaller than the sum of its proper divisors (269256078).

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

161551026 is a wasteful number, since it uses less digits than its factorization.

161551026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98655 (or 98652 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 161551026 is about 12710.2724597075. The cubic root of 161551026 is about 544.6321070172.

The spelling of 161551026 in words is "one hundred sixty-one million, five hundred fifty-one thousand, twenty-six".