142120931 has 16 divisors (see below), whose sum is σ = 153964800. Its totient is φ = 130766688.

The previous prime is 142120919. The next prime is 142120939. The reversal of 142120931 is 139021241.

It is a de Polignac number, because none of the positive numbers 2^k-142120931 is a prime.

It is a super-2 number, since 2×142120931² = 40396718056613522, 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 = 142120897 and 142120906.

It is not an unprimeable number, because it can be changed into a prime (142120939) 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, 107090 + ... + 108408.

It is an arithmetic number, because the mean of its divisors is an integer number (9622800).

Almost surely, 2^142120931 is an apocalyptic number.

142120931 is a deficient number, since it is larger than the sum of its proper divisors (11843869).

142120931 is a wasteful number, since it uses less digits than its factorization.

142120931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 142120931 is about 11921.4483599938. The cubic root of 142120931 is about 521.8584034355.

The spelling of 142120931 in words is "one hundred forty-two million, one hundred twenty thousand, nine hundred thirty-one".