142940531 has 2 divisors, whose sum is σ = 142940532. Its totient is φ = 142940530.

The previous prime is 142940503. The next prime is 142940543. The reversal of 142940531 is 135049241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 142940531 - 2¹⁴ = 142924147 is a prime.

It is a super-2 number, since 2×142940531² = 40863990805123922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 142940494 and 142940503.

It is not a weakly prime, because it can be changed into another prime (142942531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71470265 + 71470266.

It is an arithmetic number, because the mean of its divisors is an integer number (71470266).

Almost surely, 2^142940531 is an apocalyptic number.

142940531 is a deficient number, since it is larger than the sum of its proper divisors (1).

142940531 is an equidigital number, since it uses as much as digits as its factorization.

142940531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 142940531 is about 11955.7739607271. The cubic root of 142940531 is about 522.8596530261.

Adding to 142940531 its reverse (135049241), we get a palindrome (277989772).

The spelling of 142940531 in words is "one hundred forty-two million, nine hundred forty thousand, five hundred thirty-one".