30313131 has 4 divisors (see below), whose sum is σ = 40417512. Its totient is φ = 20208752.

The previous prime is 30313123. The next prime is 30313141. The reversal of 30313131 is 13131303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13131303 = 3 ⋅4377101.

It is a cyclic number.

It is not a de Polignac number, because 30313131 - 2³ = 30313123 is a prime.

It is a super-2 number, since 2×30313131² = 1837771822046322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30313131.

It is not an unprimeable number, because it can be changed into a prime (30313141) 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, 5052186 + ... + 5052191.

It is an arithmetic number, because the mean of its divisors is an integer number (10104378).

Almost surely, 2^30313131 is an apocalyptic number.

30313131 is a deficient number, since it is larger than the sum of its proper divisors (10104381).

30313131 is a wasteful number, since it uses less digits than its factorization.

30313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10104380.

The product of its (nonzero) digits is 81, while the sum is 15.

The square root of 30313131 is about 5505.7361905562. The cubic root of 30313131 is about 311.8005896215.

Adding to 30313131 its reverse (13131303), we get a palindrome (43444434).

The spelling of 30313131 in words is "thirty million, three hundred thirteen thousand, one hundred thirty-one".