203442157 has 2 divisors, whose sum is σ = 203442158. Its totient is φ = 203442156.

The previous prime is 203442133. The next prime is 203442209. The reversal of 203442157 is 751244302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115476516 + 87965641 = 10746^2 + 9379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203442157 is a prime.

It is a super-4 number, since 4×203442157⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203442457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101721078 + 101721079.

It is an arithmetic number, because the mean of its divisors is an integer number (101721079).

Almost surely, 2^203442157 is an apocalyptic number.

It is an amenable number.

203442157 is a deficient number, since it is larger than the sum of its proper divisors (1).

203442157 is an equidigital number, since it uses as much as digits as its factorization.

203442157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 203442157 is about 14263.3150774986. The cubic root of 203442157 is about 588.1394583756.

Adding to 203442157 its reverse (751244302), we get a palindrome (954686459).

The spelling of 203442157 in words is "two hundred three million, four hundred forty-two thousand, one hundred fifty-seven".