30222991 has 4 divisors (see below), whose sum is σ = 32000832. Its totient is φ = 28445152.

The previous prime is 30222979. The next prime is 30223001. The reversal of 30222991 is 19922203.

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 30222991 - 2¹⁹ = 29698703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30222911) 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, 888895 + ... + 888928.

It is an arithmetic number, because the mean of its divisors is an integer number (8000208).

Almost surely, 2^30222991 is an apocalyptic number.

30222991 is a deficient number, since it is larger than the sum of its proper divisors (1777841).

30222991 is a wasteful number, since it uses less digits than its factorization.

30222991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777840.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 30222991 is about 5497.5440880451. The cubic root of 30222991 is about 311.4912230316.

It can be divided in two parts, 30222 and 991, that added together give a palindrome (31213).

The spelling of 30222991 in words is "thirty million, two hundred twenty-two thousand, nine hundred ninety-one".