151221550 has 24 divisors (see below), whose sum is σ = 293503536. Its totient is φ = 57858240.

The previous prime is 151221547. The next prime is 151221557. The reversal of 151221550 is 55122151.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151221557) 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 11 ways as a sum of consecutive naturals, for example, 64599 + ... + 66898.

It is an arithmetic number, because the mean of its divisors is an integer number (12229314).

Almost surely, 2^151221550 is an apocalyptic number.

151221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

151221550 is a deficient number, since it is larger than the sum of its proper divisors (142281986).

151221550 is a wasteful number, since it uses less digits than its factorization.

151221550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131532 (or 131527 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 151221550 is about 12297.2171648711. The cubic root of 151221550 is about 532.7677098052.

The spelling of 151221550 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred fifty".