225891481 has 2 divisors, whose sum is σ = 225891482. Its totient is φ = 225891480.

The previous prime is 225891473. The next prime is 225891493. The reversal of 225891481 is 184198522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169416256 + 56475225 = 13016^2 + 7515^2 .

It is a cyclic number.

It is not a de Polignac number, because 225891481 - 2³ = 225891473 is a prime.

It is a super-2 number, since 2×225891481² = 102053922376746722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225891581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112945740 + 112945741.

It is an arithmetic number, because the mean of its divisors is an integer number (112945741).

Almost surely, 2^225891481 is an apocalyptic number.

It is an amenable number.

225891481 is a deficient number, since it is larger than the sum of its proper divisors (1).

225891481 is an equidigital number, since it uses as much as digits as its factorization.

225891481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 40.

The square root of 225891481 is about 15029.6866567470. The cubic root of 225891481 is about 609.0224250557.

It can be divided in two parts, 2258 and 91481, that added together give a palindrome (93739).

The spelling of 225891481 in words is "two hundred twenty-five million, eight hundred ninety-one thousand, four hundred eighty-one".