51009969 has 8 divisors (see below), whose sum is σ = 69128512. Its totient is φ = 33449040.

The previous prime is 51009967. The next prime is 51010019. The reversal of 51009969 is 96990015.

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

It is not a de Polignac number, because 51009969 - 2¹ = 51009967 is a prime.

It is a super-2 number, since 2×51009969² = 5204033874761922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51009961) 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, 139189 + ... + 139554.

It is an arithmetic number, because the mean of its divisors is an integer number (8641064).

Almost surely, 2^51009969 is an apocalyptic number.

It is an amenable number.

51009969 is a deficient number, since it is larger than the sum of its proper divisors (18118543).

51009969 is a wasteful number, since it uses less digits than its factorization.

51009969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278807.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 51009969 is about 7142.1263640459. The cubic root of 51009969 is about 370.8671383174.

The spelling of 51009969 in words is "fifty-one million, nine thousand, nine hundred sixty-nine".