157144021 has 8 divisors (see below), whose sum is σ = 161141400. Its totient is φ = 153154560.

The previous prime is 157143967. The next prime is 157144033. The reversal of 157144021 is 120441751.

It can be written as a sum of positive squares in 4 ways, for example, as 29702500 + 127441521 = 5450^2 + 11289^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157144021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157144121) 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 7 ways as a sum of consecutive naturals, for example, 76435 + ... + 78463.

It is an arithmetic number, because the mean of its divisors is an integer number (20142675).

Almost surely, 2^157144021 is an apocalyptic number.

It is an amenable number.

157144021 is a deficient number, since it is larger than the sum of its proper divisors (3997379).

157144021 is a wasteful number, since it uses less digits than its factorization.

157144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 157144021 is about 12535.7098323150. The cubic root of 157144021 is about 539.6339780685.

Adding to 157144021 its reverse (120441751), we get a palindrome (277585772).

The spelling of 157144021 in words is "one hundred fifty-seven million, one hundred forty-four thousand, twenty-one".