142726991 has 4 divisors (see below), whose sum is σ = 155702184. Its totient is φ = 129751800.

The previous prime is 142726981. The next prime is 142727021. The reversal of 142726991 is 199627241.

142726991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-142726991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142726981) 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, 6487580 + ... + 6487601.

It is an arithmetic number, because the mean of its divisors is an integer number (38925546).

Almost surely, 2^142726991 is an apocalyptic number.

142726991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

142726991 is a deficient number, since it is larger than the sum of its proper divisors (12975193).

142726991 is a wasteful number, since it uses less digits than its factorization.

142726991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12975192.

The product of its digits is 54432, while the sum is 41.

The square root of 142726991 is about 11946.8402098630. The cubic root of 142726991 is about 522.5991551936.

The spelling of 142726991 in words is "one hundred forty-two million, seven hundred twenty-six thousand, nine hundred ninety-one".