142457621 has 2 divisors, whose sum is σ = 142457622. Its totient is φ = 142457620.

The previous prime is 142457597. The next prime is 142457629. The reversal of 142457621 is 126754241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93876721 + 48580900 = 9689^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 142457621 - 2¹⁰ = 142456597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142457629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71228810 + 71228811.

It is an arithmetic number, because the mean of its divisors is an integer number (71228811).

Almost surely, 2^142457621 is an apocalyptic number.

It is an amenable number.

142457621 is a deficient number, since it is larger than the sum of its proper divisors (1).

142457621 is an equidigital number, since it uses as much as digits as its factorization.

142457621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 142457621 is about 11935.5611933415. The cubic root of 142457621 is about 522.2701793710.

The spelling of 142457621 in words is "one hundred forty-two million, four hundred fifty-seven thousand, six hundred twenty-one".