228137591 has 4 divisors (see below), whose sum is σ = 248877384. Its totient is φ = 207397800.

The previous prime is 228137573. The next prime is 228137627. The reversal of 228137591 is 195731822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228137591 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 (228137521) 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, 10369880 + ... + 10369901.

It is an arithmetic number, because the mean of its divisors is an integer number (62219346).

Almost surely, 2^228137591 is an apocalyptic number.

228137591 is a deficient number, since it is larger than the sum of its proper divisors (20739793).

228137591 is a wasteful number, since it uses less digits than its factorization.

228137591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20739792.

The product of its digits is 30240, while the sum is 38.

The square root of 228137591 is about 15104.2242766717. The cubic root of 228137591 is about 611.0343384903.

The spelling of 228137591 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, five hundred ninety-one".