30142891 has 4 divisors (see below), whose sum is σ = 30217000. Its totient is φ = 30068784.

The previous prime is 30142883. The next prime is 30142907. The reversal of 30142891 is 19824103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19824103 = 13 ⋅1524931.

It is a cyclic number.

It is not a de Polignac number, because 30142891 - 2³ = 30142883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30142591) 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, 36441 + ... + 37258.

It is an arithmetic number, because the mean of its divisors is an integer number (7554250).

Almost surely, 2^30142891 is an apocalyptic number.

30142891 is a deficient number, since it is larger than the sum of its proper divisors (74109).

30142891 is an equidigital number, since it uses as much as digits as its factorization.

30142891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74108.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 30142891 is about 5490.2541835511. The cubic root of 30142891 is about 311.2157978149.

Adding to 30142891 its reverse (19824103), we get a palindrome (49966994).

The spelling of 30142891 in words is "thirty million, one hundred forty-two thousand, eight hundred ninety-one".