151221655 has 8 divisors (see below), whose sum is σ = 195424992. Its totient is φ = 111671328.

The previous prime is 151221643. The next prime is 151221671. The reversal of 151221655 is 556122151.

151221655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151221655 - 2¹⁵ = 151188887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1163179 + ... + 1163308.

It is an arithmetic number, because the mean of its divisors is an integer number (24428124).

Almost surely, 2^151221655 is an apocalyptic number.

151221655 is a deficient number, since it is larger than the sum of its proper divisors (44203337).

151221655 is a wasteful number, since it uses less digits than its factorization.

151221655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326505.

The product of its digits is 3000, while the sum is 28.

The square root of 151221655 is about 12297.2214341289. The cubic root of 151221655 is about 532.7678331134.

The spelling of 151221655 in words is "one hundred fifty-one million, two hundred twenty-one thousand, six hundred fifty-five".