51617491 has 8 divisors (see below), whose sum is σ = 54972864. Its totient is φ = 48297600.

The previous prime is 51617453. The next prime is 51617521. The reversal of 51617491 is 19471615.

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 51617491 - 2⁹ = 51616979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51617411) 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, 5835 + ... + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (6871608).

Almost surely, 2^51617491 is an apocalyptic number.

51617491 is a deficient number, since it is larger than the sum of its proper divisors (3355373).

51617491 is a wasteful number, since it uses less digits than its factorization.

51617491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17741.

The product of its digits is 7560, while the sum is 34.

The square root of 51617491 is about 7184.5313695467. The cubic root of 51617491 is about 372.3336578441. Note that the first 3 decimals are identical.

The spelling of 51617491 in words is "fifty-one million, six hundred seventeen thousand, four hundred ninety-one".