51195009 has 4 divisors (see below), whose sum is σ = 68260016. Its totient is φ = 34130004.

The previous prime is 51194999. The next prime is 51195037. The reversal of 51195009 is 90059115.

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 not a de Polignac number, because 51195009 - 2⁵ = 51194977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51195049) 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, 8532499 + ... + 8532504.

It is an arithmetic number, because the mean of its divisors is an integer number (17065004).

Almost surely, 2^51195009 is an apocalyptic number.

It is an amenable number.

51195009 is a deficient number, since it is larger than the sum of its proper divisors (17065007).

51195009 is a wasteful number, since it uses less digits than its factorization.

51195009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17065006.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 51195009 is about 7155.0687627723. The cubic root of 51195009 is about 371.3150405835.

The spelling of 51195009 in words is "fifty-one million, one hundred ninety-five thousand, nine".