51620169 has 8 divisors (see below), whose sum is σ = 72449440. Its totient is φ = 32602176.

The previous prime is 51620161. The next prime is 51620197. The reversal of 51620169 is 96102615.

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

It is not a de Polignac number, because 51620169 - 2³ = 51620161 is a prime.

It is a super-2 number, since 2×51620169² = 5329283695177122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51620161) 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, 452752 + ... + 452865.

It is an arithmetic number, because the mean of its divisors is an integer number (9056180).

Almost surely, 2^51620169 is an apocalyptic number.

It is an amenable number.

51620169 is a deficient number, since it is larger than the sum of its proper divisors (20829271).

51620169 is a wasteful number, since it uses less digits than its factorization.

51620169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905639.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 51620169 is about 7184.7177397585. The cubic root of 51620169 is about 372.3400968262.

The spelling of 51620169 in words is "fifty-one million, six hundred twenty thousand, one hundred sixty-nine".