154561220 has 24 divisors (see below), whose sum is σ = 354086208. Its totient is φ = 56204000.

The previous prime is 154561217. The next prime is 154561223. The reversal of 154561220 is 22165451.

It is an interprime number because it is at equal distance from previous prime (154561217) and next prime (154561223).

It is a self number, because there is not a number n which added to its sum of digits gives 154561220.

It is not an unprimeable number, because it can be changed into a prime (154561223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351056 + ... + 351495.

It is an arithmetic number, because the mean of its divisors is an integer number (14753592).

Almost surely, 2^154561220 is an apocalyptic number.

154561220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

154561220 is an abundant number, since it is smaller than the sum of its proper divisors (199524988).

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

154561220 is a wasteful number, since it uses less digits than its factorization.

154561220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702571 (or 702569 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 154561220 is about 12432.2652803099. The cubic root of 154561220 is about 536.6611772818.

The spelling of 154561220 in words is "one hundred fifty-four million, five hundred sixty-one thousand, two hundred twenty".