155022251 has 4 divisors (see below), whose sum is σ = 155070552. Its totient is φ = 154973952.

The previous prime is 155022229. The next prime is 155022293. The reversal of 155022251 is 152220551.

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

It is a cyclic number.

It is not a de Polignac number, because 155022251 - 2¹⁰ = 155021227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155022221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18965 + ... + 25878.

It is an arithmetic number, because the mean of its divisors is an integer number (38767638).

Almost surely, 2^155022251 is an apocalyptic number.

155022251 is a deficient number, since it is larger than the sum of its proper divisors (48301).

155022251 is an equidigital number, since it uses as much as digits as its factorization.

155022251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48300.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 155022251 is about 12450.7931875845. The cubic root of 155022251 is about 537.1942386454.

The spelling of 155022251 in words is "one hundred fifty-five million, twenty-two thousand, two hundred fifty-one".