142220431 has 16 divisors (see below), whose sum is σ = 154361088. Its totient is φ = 130680000.

The previous prime is 142220413. The next prime is 142220447. The reversal of 142220431 is 134022241.

142220431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 6-Lehmer number, since φ(142220431) divides (142220431-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 142220431 - 2⁵ = 142220399 is a prime.

It is a super-2 number, since 2×142220431² = 40453301987651522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142220399 and 142220408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142220231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62056 + ... + 64306.

It is an arithmetic number, because the mean of its divisors is an integer number (9647568).

Almost surely, 2^142220431 is an apocalyptic number.

142220431 is a deficient number, since it is larger than the sum of its proper divisors (12140657).

142220431 is a wasteful number, since it uses less digits than its factorization.

142220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142220431 is about 11925.6207804877. The cubic root of 142220431 is about 521.9801607723.

Adding to 142220431 its reverse (134022241), we get a palindrome (276242672).

The spelling of 142220431 in words is "one hundred forty-two million, two hundred twenty thousand, four hundred thirty-one".