157222145 has 8 divisors (see below), whose sum is σ = 190398120. Its totient is φ = 124623360.

The previous prime is 157222141. The next prime is 157222151. The reversal of 157222145 is 541222751.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18524416 + 138697729 = 4304^2 + 11777^2 .

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

It is not a de Polignac number, because 157222145 - 2² = 157222141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157222141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143696 + ... + 144785.

It is an arithmetic number, because the mean of its divisors is an integer number (23799765).

Almost surely, 2^157222145 is an apocalyptic number.

It is an amenable number.

157222145 is a deficient number, since it is larger than the sum of its proper divisors (33175975).

157222145 is a wasteful number, since it uses less digits than its factorization.

157222145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288595.

The product of its digits is 5600, while the sum is 29.

The square root of 157222145 is about 12538.8255032120. The cubic root of 157222145 is about 539.7233894255.

Adding to 157222145 its reverse (541222751), we get a palindrome (698444896).

The spelling of 157222145 in words is "one hundred fifty-seven million, two hundred twenty-two thousand, one hundred forty-five".