51691011 has 8 divisors (see below), whose sum is σ = 69142800. Its totient is φ = 34349952.

The previous prime is 51690983. The next prime is 51691019. The reversal of 51691011 is 11019615.

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

It is not a de Polignac number, because 51691011 - 2⁵ = 51690979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51691019) 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, 26586 + ... + 28463.

It is an arithmetic number, because the mean of its divisors is an integer number (8642850).

Almost surely, 2^51691011 is an apocalyptic number.

51691011 is a deficient number, since it is larger than the sum of its proper divisors (17451789).

51691011 is a wasteful number, since it uses less digits than its factorization.

51691011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55365.

The product of its (nonzero) digits is 270, while the sum is 24.

The square root of 51691011 is about 7189.6460969925. The cubic root of 51691011 is about 372.5103484956.

The spelling of 51691011 in words is "fifty-one million, six hundred ninety-one thousand, eleven".