51701691 has 8 divisors (see below), whose sum is σ = 70798864. Its totient is φ = 33536160.

The previous prime is 51701687. The next prime is 51701719. The reversal of 51701691 is 19610715.

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

It is not a de Polignac number, because 51701691 - 2² = 51701687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51701621) 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, 232780 + ... + 233001.

It is an arithmetic number, because the mean of its divisors is an integer number (8849858).

Almost surely, 2^51701691 is an apocalyptic number.

51701691 is a deficient number, since it is larger than the sum of its proper divisors (19097173).

51701691 is a wasteful number, since it uses less digits than its factorization.

51701691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465821.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 51701691 is about 7190.3887933825. The cubic root of 51701691 is about 372.5360018054.

The spelling of 51701691 in words is "fifty-one million, seven hundred one thousand, six hundred ninety-one".