225515511 has 12 divisors (see below), whose sum is σ = 350802088. Its totient is φ = 138778704.

The previous prime is 225515491. The next prime is 225515531. The reversal of 225515511 is 115515522.

It is an interprime number because it is at equal distance from previous prime (225515491) and next prime (225515531).

It is not a de Polignac number, because 225515511 - 2⁹ = 225514999 is a prime.

It is a super-2 number, since 2×225515511² = 101714491403182242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225515531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 963625 + ... + 963858.

Almost surely, 2^225515511 is an apocalyptic number.

225515511 is a deficient number, since it is larger than the sum of its proper divisors (125286577).

225515511 is a wasteful number, since it uses less digits than its factorization.

225515511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927502 (or 1927499 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 225515511 is about 15017.1738686079. The cubic root of 225515511 is about 608.6843551835.

It can be divided in two parts, 2255 and 15511, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 225515511 in words is "two hundred twenty-five million, five hundred fifteen thousand, five hundred eleven".