29971145 has 4 divisors (see below), whose sum is σ = 35965380. Its totient is φ = 23976912.

The previous prime is 29971133. The next prime is 29971169. The reversal of 29971145 is 54117992.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6661561 + 23309584 = 2581^2 + 4828^2 .

It is a cyclic number.

It is not a de Polignac number, because 29971145 - 2¹⁰ = 29970121 is a prime.

It is a super-2 number, since 2×29971145² = 1796539065222050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 29971099 and 29971108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2997110 + ... + 2997119.

It is an arithmetic number, because the mean of its divisors is an integer number (8991345).

Almost surely, 2^29971145 is an apocalyptic number.

It is an amenable number.

29971145 is a deficient number, since it is larger than the sum of its proper divisors (5994235).

29971145 is an equidigital number, since it uses as much as digits as its factorization.

29971145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5994234.

The product of its digits is 22680, while the sum is 38.

The square root of 29971145 is about 5474.5908522921. The cubic root of 29971145 is about 310.6235973120.

The spelling of 29971145 in words is "twenty-nine million, nine hundred seventy-one thousand, one hundred forty-five".