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231531500243 = 1252211848983
BaseRepresentation
bin1101011110100001011…
…0100101001011010011
3211010121211100212020202
43113220112211023103
512243134031001433
6254210351325415
722504365165101
oct3275026451323
9733554325222
10231531500243
118a21255000a
1238a5752086b
1318aaaa85324
14b2c5aacc71
15605176aee8
hex35e85a52d3

231531500243 has 4 divisors (see below), whose sum is σ = 231533474448. Its totient is φ = 231529526040.

The previous prime is 231531500197. The next prime is 231531500257. The reversal of 231531500243 is 342005135132.

It is a happy number.

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 231531500243 - 216 = 231531434707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231531500443) 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, 799271 + ... + 1049712.

It is an arithmetic number, because the mean of its divisors is an integer number (57883368612).

Almost surely, 2231531500243 is an apocalyptic number.

231531500243 is a deficient number, since it is larger than the sum of its proper divisors (1974205).

231531500243 is a wasteful number, since it uses less digits than its factorization.

231531500243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974204.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 231531500243 its reverse (342005135132), we get a palindrome (573536635375).

The spelling of 231531500243 in words is "two hundred thirty-one billion, five hundred thirty-one million, five hundred thousand, two hundred forty-three".

Divisors: 1 125221 1848983 231531500243