308142931 has 4 divisors (see below), whose sum is σ = 324361000. Its totient is φ = 291924864.

The previous prime is 308142881. The next prime is 308142941. The reversal of 308142931 is 139241803.

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 308142931 - 2⁷ = 308142803 is a prime.

It is a super-2 number, since 2×308142931² = 189904131850541522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 308142893 and 308142902.

It is not an unprimeable number, because it can be changed into a prime (308142941) 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, 8109006 + ... + 8109043.

It is an arithmetic number, because the mean of its divisors is an integer number (81090250).

Almost surely, 2^308142931 is an apocalyptic number.

308142931 is a deficient number, since it is larger than the sum of its proper divisors (16218069).

308142931 is a wasteful number, since it uses less digits than its factorization.

308142931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16218068.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 308142931 is about 17554.0004272530. Note that the first 3 decimals coincide. The cubic root of 308142931 is about 675.4357906483.

The spelling of 308142931 in words is "three hundred eight million, one hundred forty-two thousand, nine hundred thirty-one".