142401431 has 4 divisors (see below), whose sum is σ = 142699200. Its totient is φ = 142103664.

The previous prime is 142401421. The next prime is 142401439. The reversal of 142401431 is 134104241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142401431 is a prime.

It is a super-2 number, since 2×142401431² = 40556335101695522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142401439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148166 + ... + 149123.

It is an arithmetic number, because the mean of its divisors is an integer number (35674800).

Almost surely, 2^142401431 is an apocalyptic number.

142401431 is a deficient number, since it is larger than the sum of its proper divisors (297769).

142401431 is an equidigital number, since it uses as much as digits as its factorization.

142401431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297768.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 142401431 is about 11933.2070710266. The cubic root of 142401431 is about 522.2015034602.

Adding to 142401431 its reverse (134104241), we get a palindrome (276505672).

The spelling of 142401431 in words is "one hundred forty-two million, four hundred one thousand, four hundred thirty-one".