51159621 has 8 divisors (see below), whose sum is σ = 68248224. Its totient is φ = 34088720.

The previous prime is 51159617. The next prime is 51159649. The reversal of 51159621 is 12695115.

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 51159621 - 2² = 51159617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51159601) 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, 5506 + ... + 11516.

It is an arithmetic number, because the mean of its divisors is an integer number (8531028).

Almost surely, 2^51159621 is an apocalyptic number.

It is an amenable number.

51159621 is a deficient number, since it is larger than the sum of its proper divisors (17088603).

51159621 is a wasteful number, since it uses less digits than its factorization.

51159621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851.

The product of its digits is 2700, while the sum is 30.

The square root of 51159621 is about 7152.5954030687. The cubic root of 51159621 is about 371.2294650184.

The spelling of 51159621 in words is "fifty-one million, one hundred fifty-nine thousand, six hundred twenty-one".