142402531 has 2 divisors, whose sum is σ = 142402532. Its totient is φ = 142402530.

The previous prime is 142402517. The next prime is 142402543. The reversal of 142402531 is 135204241.

It is a strong prime.

It is an emirp because it is prime and its reverse (135204241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142402531 - 2⁹ = 142402019 is a prime.

It is a super-2 number, since 2×142402531² = 40556961670411922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142402501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71201265 + 71201266.

It is an arithmetic number, because the mean of its divisors is an integer number (71201266).

Almost surely, 2^142402531 is an apocalyptic number.

142402531 is a deficient number, since it is larger than the sum of its proper divisors (1).

142402531 is an equidigital number, since it uses as much as digits as its factorization.

142402531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 142402531 is about 11933.2531608108. The cubic root of 142402531 is about 522.2028480632.

Adding to 142402531 its reverse (135204241), we get a palindrome (277606772).

The spelling of 142402531 in words is "one hundred forty-two million, four hundred two thousand, five hundred thirty-one".