142552391 has 2 divisors, whose sum is σ = 142552392. Its totient is φ = 142552390.

The previous prime is 142552387. The next prime is 142552409. The reversal of 142552391 is 193255241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142552391 - 2² = 142552387 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142552301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71276195 + 71276196.

It is an arithmetic number, because the mean of its divisors is an integer number (71276196).

Almost surely, 2^142552391 is an apocalyptic number.

142552391 is a deficient number, since it is larger than the sum of its proper divisors (1).

142552391 is an equidigital number, since it uses as much as digits as its factorization.

142552391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 142552391 is about 11939.5306021636. The cubic root of 142552391 is about 522.3859671937.

The spelling of 142552391 in words is "one hundred forty-two million, five hundred fifty-two thousand, three hundred ninety-one".