51861601 has 4 divisors (see below), whose sum is σ = 56576304. Its totient is φ = 47146900.

The previous prime is 51861571. The next prime is 51861631. The reversal of 51861601 is 10616815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51861571) and next prime (51861631).

It is a cyclic number.

It is not a de Polignac number, because 51861601 - 2¹¹ = 51859553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51861601.

It is not an unprimeable number, because it can be changed into a prime (51861631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2357335 + ... + 2357356.

It is an arithmetic number, because the mean of its divisors is an integer number (14144076).

Almost surely, 2^51861601 is an apocalyptic number.

It is an amenable number.

51861601 is a deficient number, since it is larger than the sum of its proper divisors (4714703).

51861601 is a wasteful number, since it uses less digits than its factorization.

51861601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714702.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 51861601 is about 7201.4999132125. The cubic root of 51861601 is about 372.9196831288.

The spelling of 51861601 in words is "fifty-one million, eight hundred sixty-one thousand, six hundred one".