161390526 has 96 divisors (see below), whose sum is σ = 375072768. Its totient is φ = 46200000.

The previous prime is 161390519. The next prime is 161390543. The reversal of 161390526 is 625093161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1597876 + ... + 1597976.

It is an arithmetic number, because the mean of its divisors is an integer number (3907008).

Almost surely, 2^161390526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161390526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187536384).

161390526 is an abundant number, since it is smaller than the sum of its proper divisors (213682242).

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

161390526 is a wasteful number, since it uses less digits than its factorization.

161390526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 161390526 is about 12703.9571000535. The cubic root of 161390526 is about 544.4516843161.

The spelling of 161390526 in words is "one hundred sixty-one million, three hundred ninety thousand, five hundred twenty-six".