51966591 has 8 divisors (see below), whose sum is σ = 72301440. Its totient is φ = 33138072.

The previous prime is 51966587. The next prime is 51966599. The reversal of 51966591 is 19566915.

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

It is not a de Polignac number, because 51966591 - 2² = 51966587 is a prime.

It is a super-2 number, since 2×51966591² = 5401053160322562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51966599) 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, 376501 + ... + 376638.

It is an arithmetic number, because the mean of its divisors is an integer number (9037680).

Almost surely, 2^51966591 is an apocalyptic number.

51966591 is a deficient number, since it is larger than the sum of its proper divisors (20334849).

51966591 is a wasteful number, since it uses less digits than its factorization.

51966591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753165.

The product of its digits is 72900, while the sum is 42.

The square root of 51966591 is about 7208.7856813752. The cubic root of 51966591 is about 373.1711630020.

The spelling of 51966591 in words is "fifty-one million, nine hundred sixty-six thousand, five hundred ninety-one".