30691147 has 4 divisors (see below), whose sum is σ = 31681216. Its totient is φ = 29701080.

The previous prime is 30691127. The next prime is 30691153. The reversal of 30691147 is 74119603.

It is a happy number.

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 30691147 - 2¹⁹ = 30166859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 990037 = 30691147 / (3 + 0 + 6 + 9 + 1 + 1 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30691127) 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, 494988 + ... + 495049.

It is an arithmetic number, because the mean of its divisors is an integer number (7920304).

Almost surely, 2^30691147 is an apocalyptic number.

30691147 is a deficient number, since it is larger than the sum of its proper divisors (990069).

30691147 is an equidigital number, since it uses as much as digits as its factorization.

30691147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990068.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 30691147 is about 5539.9591153726. The cubic root of 30691147 is about 313.0913287778.

The spelling of 30691147 in words is "thirty million, six hundred ninety-one thousand, one hundred forty-seven".