931242139 has 4 divisors (see below), whose sum is σ = 961282240. Its totient is φ = 901202040.

The previous prime is 931242127. The next prime is 931242163.

931242139 is nontrivially palindromic in base 10.

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 931242139 - 2¹⁵ = 931209371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (931252139) 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, 15020004 + ... + 15020065.

It is an arithmetic number, because the mean of its divisors is an integer number (240320560).

Almost surely, 2^931242139 is an apocalyptic number.

931242139 is a deficient number, since it is larger than the sum of its proper divisors (30040101).

931242139 is a wasteful number, since it uses less digits than its factorization.

931242139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30040100.

The product of its digits is 11664, while the sum is 34.

The square root of 931242139 is about 30516.2602394199. The cubic root of 931242139 is about 976.5343849053.

The spelling of 931242139 in words is "nine hundred thirty-one million, two hundred forty-two thousand, one hundred thirty-nine".