Search a number
-
+
131243221 = 235879721
BaseRepresentation
bin1111101001010…
…01110011010101
3100010221211212001
413310221303111
5232044240341
621004555301
73152356204
oct764516325
9303854761
10131243221
11680a0a7a
1237b52b31
1321262615
141360523b
15b7c6d31
hex7d29cd5

131243221 has 8 divisors (see below), whose sum is σ = 137196864. Its totient is φ = 125310240.

The previous prime is 131243219. The next prime is 131243251. The reversal of 131243221 is 122342131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131243221 - 21 = 131243219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131243251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8641 + ... + 18361.

It is an arithmetic number, because the mean of its divisors is an integer number (17149608).

Almost surely, 2131243221 is an apocalyptic number.

It is an amenable number.

131243221 is a deficient number, since it is larger than the sum of its proper divisors (5953643).

131243221 is an equidigital number, since it uses as much as digits as its factorization.

131243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331.

The product of its digits is 288, while the sum is 19.

The square root of 131243221 is about 11456.1433737537. The cubic root of 131243221 is about 508.1894288588.

Adding to 131243221 its reverse (122342131), we get a palindrome (253585352).

The spelling of 131243221 in words is "one hundred thirty-one million, two hundred forty-three thousand, two hundred twenty-one".

Divisors: 1 23 587 9721 13501 223583 5706227 131243221