151221566 has 4 divisors (see below), whose sum is σ = 226832352. Its totient is φ = 75610782.

The previous prime is 151221557. The next prime is 151221593. The reversal of 151221566 is 665122151.

It is a happy number.

151221566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37805390 + ... + 37805393.

It is an arithmetic number, because the mean of its divisors is an integer number (56708088).

Almost surely, 2^151221566 is an apocalyptic number.

151221566 is a deficient number, since it is larger than the sum of its proper divisors (75610786).

151221566 is an equidigital number, since it uses as much as digits as its factorization.

151221566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75610785.

The product of its digits is 3600, while the sum is 29.

The square root of 151221566 is about 12297.2178154248. The cubic root of 151221566 is about 532.7677285950.

The spelling of 151221566 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred sixty-six".