142191231 has 64 divisors (see below), whose sum is σ = 249446400. Its totient is φ = 69952896.

The previous prime is 142191229. The next prime is 142191277. The reversal of 142191231 is 132191241.

It is not a de Polignac number, because 142191231 - 2¹ = 142191229 is a prime.

It is a super-2 number, since 2×142191231² = 40436692346590722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142191131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 409600 + ... + 409946.

It is an arithmetic number, because the mean of its divisors is an integer number (3897600).

Almost surely, 2^142191231 is an apocalyptic number.

142191231 is a deficient number, since it is larger than the sum of its proper divisors (107255169).

142191231 is a wasteful number, since it uses less digits than its factorization.

142191231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its digits is 432, while the sum is 24.

The square root of 142191231 is about 11924.3964627146. The cubic root of 142191231 is about 521.9444348600.

The spelling of 142191231 in words is "one hundred forty-two million, one hundred ninety-one thousand, two hundred thirty-one".