30491969 has 2 divisors, whose sum is σ = 30491970. Its totient is φ = 30491968.

The previous prime is 30491939. The next prime is 30492041. The reversal of 30491969 is 96919403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26832400 + 3659569 = 5180^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 30491969 - 2¹⁶ = 30426433 is a prime.

It is a super-2 number, since 2×30491969² = 1859520346993922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1886468 and since 30491969 and 1886468 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (30491939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15245984 + 15245985.

It is an arithmetic number, because the mean of its divisors is an integer number (15245985).

Almost surely, 2^30491969 is an apocalyptic number.

It is an amenable number.

30491969 is a deficient number, since it is larger than the sum of its proper divisors (1).

30491969 is an equidigital number, since it uses as much as digits as its factorization.

30491969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 30491969 is about 5521.9533681479. The cubic root of 30491969 is about 312.4125630576.

The spelling of 30491969 in words is "thirty million, four hundred ninety-one thousand, nine hundred sixty-nine".