51990895 has 8 divisors (see below), whose sum is σ = 68060880. Its totient is φ = 37811520.

The previous prime is 51990893. The next prime is 51990931. The reversal of 51990895 is 59809915.

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

It is not a de Polignac number, because 51990895 - 2¹ = 51990893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51990893) 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, 472590 + ... + 472699.

It is an arithmetic number, because the mean of its divisors is an integer number (8507610).

Almost surely, 2^51990895 is an apocalyptic number.

51990895 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51990895 is a deficient number, since it is larger than the sum of its proper divisors (16069985).

51990895 is a wasteful number, since it uses less digits than its factorization.

51990895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945305.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 51990895 is about 7210.4712051294. The cubic root of 51990895 is about 373.2293294652.

The spelling of 51990895 in words is "fifty-one million, nine hundred ninety thousand, eight hundred ninety-five".