142538491 has 2 divisors, whose sum is σ = 142538492. Its totient is φ = 142538490.

The previous prime is 142538477. The next prime is 142538533. The reversal of 142538491 is 194835241.

It is a weak prime.

It is an emirp because it is prime and its reverse (194835241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142538491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142538491.

It is not a weakly prime, because it can be changed into another prime (142538441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71269245 + 71269246.

It is an arithmetic number, because the mean of its divisors is an integer number (71269246).

Almost surely, 2^142538491 is an apocalyptic number.

142538491 is a deficient number, since it is larger than the sum of its proper divisors (1).

142538491 is an equidigital number, since it uses as much as digits as its factorization.

142538491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 142538491 is about 11938.9484880370. The cubic root of 142538491 is about 522.3689877031.

The spelling of 142538491 in words is "one hundred forty-two million, five hundred thirty-eight thousand, four hundred ninety-one".