51623801 has 4 divisors (see below), whose sum is σ = 51756900. Its totient is φ = 51490704.

The previous prime is 51623791. The next prime is 51623809. The reversal of 51623801 is 10832615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10832615 = 5 ⋅2166523.

It can be written as a sum of positive squares in 2 ways, for example, as 26020201 + 25603600 = 5101^2 + 5060^2 .

It is a cyclic number.

It is not a de Polignac number, because 51623801 - 2¹⁴ = 51607417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51623809) 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, 65966 + ... + 66743.

It is an arithmetic number, because the mean of its divisors is an integer number (12939225).

Almost surely, 2^51623801 is an apocalyptic number.

It is an amenable number.

51623801 is a deficient number, since it is larger than the sum of its proper divisors (133099).

51623801 is a wasteful number, since it uses less digits than its factorization.

51623801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133098.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51623801 is about 7184.9704940243. The cubic root of 51623801 is about 372.3488292496.

The spelling of 51623801 in words is "fifty-one million, six hundred twenty-three thousand, eight hundred one".