51623501 has 4 divisors (see below), whose sum is σ = 51669504. Its totient is φ = 51577500.

The previous prime is 51623491. The next prime is 51623503. The reversal of 51623501 is 10532615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10532615 = 5 ⋅2106523.

It is a cyclic number.

It is not a de Polignac number, because 51623501 - 2¹⁴ = 51607117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51623503) 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, 21275 + ... + 23576.

It is an arithmetic number, because the mean of its divisors is an integer number (12917376).

Almost surely, 2^51623501 is an apocalyptic number.

It is an amenable number.

51623501 is a deficient number, since it is larger than the sum of its proper divisors (46003).

51623501 is a wasteful number, since it uses less digits than its factorization.

51623501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46002.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51623501 is about 7184.9496170815. The cubic root of 51623501 is about 372.3481079746.

The spelling of 51623501 in words is "fifty-one million, six hundred twenty-three thousand, five hundred one".