161503254 has 64 divisors (see below), whose sum is σ = 395700480. Its totient is φ = 48418560.

The previous prime is 161503241. The next prime is 161503259. The reversal of 161503254 is 452305161.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161503259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56217 + ... + 59019.

It is an arithmetic number, because the mean of its divisors is an integer number (6182820).

Almost surely, 2^161503254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161503254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197850240).

161503254 is an abundant number, since it is smaller than the sum of its proper divisors (234197226).

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

161503254 is a wasteful number, since it uses less digits than its factorization.

161503254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922 (or 2916 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 161503254 is about 12708.3930534116. The cubic root of 161503254 is about 544.5784176232.

The spelling of 161503254 in words is "one hundred sixty-one million, five hundred three thousand, two hundred fifty-four".