228140531 has 4 divisors (see below), whose sum is σ = 228522000. Its totient is φ = 227759064.

The previous prime is 228140513. The next prime is 228140573. The reversal of 228140531 is 135041822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135041822 = 2 ⋅67520911.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228140531 is a prime.

It is a super-2 number, since 2×228140531² = 104096203769923922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228140531.

It is not an unprimeable number, because it can be changed into a prime (228142531) 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, 189836 + ... + 191033.

It is an arithmetic number, because the mean of its divisors is an integer number (57130500).

Almost surely, 2^228140531 is an apocalyptic number.

228140531 is a deficient number, since it is larger than the sum of its proper divisors (381469).

228140531 is an equidigital number, since it uses as much as digits as its factorization.

228140531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381468.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 228140531 is about 15104.3216001249. The cubic root of 228140531 is about 611.0369632707.

The spelling of 228140531 in words is "two hundred twenty-eight million, one hundred forty thousand, five hundred thirty-one".