228261961 has 4 divisors (see below), whose sum is σ = 228330000. Its totient is φ = 228193924.

The previous prime is 228261911. The next prime is 228261967. The reversal of 228261961 is 169162822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169162822 = 2 ⋅84581411.

It is a cyclic number.

It is not a de Polignac number, because 228261961 - 2¹⁵ = 228229193 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 228261961.

It is not an unprimeable number, because it can be changed into a prime (228261967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28711 + ... + 35788.

It is an arithmetic number, because the mean of its divisors is an integer number (57082500).

Almost surely, 2^228261961 is an apocalyptic number.

It is an amenable number.

228261961 is a deficient number, since it is larger than the sum of its proper divisors (68039).

228261961 is an equidigital number, since it uses as much as digits as its factorization.

228261961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68038.

The product of its digits is 20736, while the sum is 37.

The square root of 228261961 is about 15108.3407758761. The cubic root of 228261961 is about 611.1453541498.

The spelling of 228261961 in words is "two hundred twenty-eight million, two hundred sixty-one thousand, nine hundred sixty-one".