142521131 has 4 divisors (see below), whose sum is σ = 142839000. Its totient is φ = 142203264.

The previous prime is 142521121. The next prime is 142521139. The reversal of 142521131 is 131125241.

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

It is a cyclic number.

It is not a de Polignac number, because 142521131 - 2²² = 138326827 is a prime.

It is a super-2 number, since 2×142521131² = 40624545563038322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142521139) 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, 158261 + ... + 159158.

It is an arithmetic number, because the mean of its divisors is an integer number (35709750).

Almost surely, 2^142521131 is an apocalyptic number.

142521131 is a deficient number, since it is larger than the sum of its proper divisors (317869).

142521131 is an equidigital number, since it uses as much as digits as its factorization.

142521131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317868.

The product of its digits is 240, while the sum is 20.

The square root of 142521131 is about 11938.2214336977. The cubic root of 142521131 is about 522.3477801127.

Adding to 142521131 its reverse (131125241), we get a palindrome (273646372).

The spelling of 142521131 in words is "one hundred forty-two million, five hundred twenty-one thousand, one hundred thirty-one".