228641531 has 4 divisors (see below), whose sum is σ = 228820200. Its totient is φ = 228462864.

The previous prime is 228641527. The next prime is 228641557. The reversal of 228641531 is 135146822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135146822 = 2 ⋅67573411.

It is a cyclic number.

It is not a de Polignac number, because 228641531 - 2² = 228641527 is a prime.

It is a super-2 number, since 2×228641531² = 104553899396047922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228641521) 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, 87401 + ... + 89978.

It is an arithmetic number, because the mean of its divisors is an integer number (57205050).

Almost surely, 2^228641531 is an apocalyptic number.

228641531 is a deficient number, since it is larger than the sum of its proper divisors (178669).

228641531 is a wasteful number, since it uses less digits than its factorization.

228641531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178668.

The product of its digits is 11520, while the sum is 32.

The square root of 228641531 is about 15120.8971625364. The cubic root of 228641531 is about 611.4839183440.

The spelling of 228641531 in words is "two hundred twenty-eight million, six hundred forty-one thousand, five hundred thirty-one".