231512949 has 6 divisors (see below), whose sum is σ = 334407606. Its totient is φ = 154341960.

The previous prime is 231512947. The next prime is 231512951. The reversal of 231512949 is 949215132.

It is an interprime number because it is at equal distance from previous prime (231512947) and next prime (231512951).

It can be written as a sum of positive squares in only one way, i.e., 231252849 + 260100 = 15207^2 + 510^2 .

It is not a de Polignac number, because 231512949 - 2¹ = 231512947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231512947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12861822 + ... + 12861839.

It is an arithmetic number, because the mean of its divisors is an integer number (55734601).

Almost surely, 2^231512949 is an apocalyptic number.

It is an amenable number.

231512949 is a deficient number, since it is larger than the sum of its proper divisors (102894657).

231512949 is a wasteful number, since it uses less digits than its factorization.

231512949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25723667 (or 25723664 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 231512949 is about 15215.5495792955. The cubic root of 231512949 is about 614.0330710718.

The spelling of 231512949 in words is "two hundred thirty-one million, five hundred twelve thousand, nine hundred forty-nine".