145242157 has 2 divisors, whose sum is σ = 145242158. Its totient is φ = 145242156.

The previous prime is 145242143. The next prime is 145242269. The reversal of 145242157 is 751242541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127103076 + 18139081 = 11274^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 145242157 - 2⁷ = 145242029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145242107) 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 as a sum of consecutive naturals, namely, 72621078 + 72621079.

It is an arithmetic number, because the mean of its divisors is an integer number (72621079).

Almost surely, 2^145242157 is an apocalyptic number.

It is an amenable number.

145242157 is a deficient number, since it is larger than the sum of its proper divisors (1).

145242157 is an equidigital number, since it uses as much as digits as its factorization.

145242157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 31.

The square root of 145242157 is about 12051.6454063335. The cubic root of 145242157 is about 525.6510827727.

Adding to 145242157 its reverse (751242541), we get a palindrome (896484698).

The spelling of 145242157 in words is "one hundred forty-five million, two hundred forty-two thousand, one hundred fifty-seven".