225751261 has 4 divisors (see below), whose sum is σ = 227986524. Its totient is φ = 223516000.

The previous prime is 225751243. The next prime is 225751277. The reversal of 225751261 is 162157522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162157522 = 2 ⋅81078761.

It can be written as a sum of positive squares in 2 ways, for example, as 210424036 + 15327225 = 14506^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 225751261 - 2¹¹ = 225749213 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 (225751661) 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, 1117480 + ... + 1117681.

It is an arithmetic number, because the mean of its divisors is an integer number (56996631).

Almost surely, 2^225751261 is an apocalyptic number.

It is an amenable number.

225751261 is a deficient number, since it is larger than the sum of its proper divisors (2235263).

225751261 is a wasteful number, since it uses less digits than its factorization.

225751261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235262.

The product of its digits is 8400, while the sum is 31.

The square root of 225751261 is about 15025.0211647106. The cubic root of 225751261 is about 608.8963840027.

The spelling of 225751261 in words is "two hundred twenty-five million, seven hundred fifty-one thousand, two hundred sixty-one".