142521493 has 2 divisors, whose sum is σ = 142521494. Its totient is φ = 142521492.

The previous prime is 142521481. The next prime is 142521497. The reversal of 142521493 is 394125241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86825124 + 55696369 = 9318^2 + 7463^2 .

It is a cyclic number.

It is not a de Polignac number, because 142521493 - 2⁵ = 142521461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142521497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71260746 + 71260747.

It is an arithmetic number, because the mean of its divisors is an integer number (71260747).

Almost surely, 2^142521493 is an apocalyptic number.

It is an amenable number.

142521493 is a deficient number, since it is larger than the sum of its proper divisors (1).

142521493 is an equidigital number, since it uses as much as digits as its factorization.

142521493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 142521493 is about 11938.2365950755. The cubic root of 142521493 is about 522.3482223623.

The spelling of 142521493 in words is "one hundred forty-two million, five hundred twenty-one thousand, four hundred ninety-three".