51225591 has 8 divisors (see below), whose sum is σ = 68356224. Its totient is φ = 34122680.

The previous prime is 51225583. The next prime is 51225611. The reversal of 51225591 is 19552215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51225591 - 2³ = 51225583 is a prime.

It is a super-2 number, since 2×51225591² = 5248122346598562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2145 + ... + 10346.

It is an arithmetic number, because the mean of its divisors is an integer number (8544528).

Almost surely, 2^51225591 is an apocalyptic number.

51225591 is a deficient number, since it is larger than the sum of its proper divisors (17130633).

51225591 is a wasteful number, since it uses less digits than its factorization.

51225591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13861.

The product of its digits is 4500, while the sum is 30.

The square root of 51225591 is about 7157.2055300934. The cubic root of 51225591 is about 371.3889624782.

The spelling of 51225591 in words is "fifty-one million, two hundred twenty-five thousand, five hundred ninety-one".