142991851 has 4 divisors (see below), whose sum is σ = 149208912. Its totient is φ = 136774792.

The previous prime is 142991833. The next prime is 142991881. The reversal of 142991851 is 158199241.

142991851 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 not a de Polignac number, because 142991851 - 2²³ = 134603243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142991801) 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, 3108496 + ... + 3108541.

It is an arithmetic number, because the mean of its divisors is an integer number (37302228).

Almost surely, 2^142991851 is an apocalyptic number.

142991851 is a deficient number, since it is larger than the sum of its proper divisors (6217061).

142991851 is an equidigital number, since it uses as much as digits as its factorization.

142991851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6217060.

The product of its digits is 25920, while the sum is 40.

The square root of 142991851 is about 11957.9200114401. The cubic root of 142991851 is about 522.9222197139.

The spelling of 142991851 in words is "one hundred forty-two million, nine hundred ninety-one thousand, eight hundred fifty-one".