155621452 has 36 divisors (see below), whose sum is σ = 318536064. Its totient is φ = 66329760.

The previous prime is 155621449. The next prime is 155621461. The reversal of 155621452 is 254126551.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 35358 + ... + 39514.

It is an arithmetic number, because the mean of its divisors is an integer number (8848224).

Almost surely, 2^155621452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155621452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159268032).

155621452 is an abundant number, since it is smaller than the sum of its proper divisors (162914612).

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

155621452 is a wasteful number, since it uses less digits than its factorization.

155621452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4357 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 155621452 is about 12474.8327443698. The cubic root of 155621452 is about 537.8854802475.

The spelling of 155621452 in words is "one hundred fifty-five million, six hundred twenty-one thousand, four hundred fifty-two".