51122405 has 8 divisors (see below), whose sum is σ = 61471872. Its totient is φ = 40814608.

The previous prime is 51122387. The next prime is 51122413. The reversal of 51122405 is 50422115.

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

It is a cyclic number.

It is not a de Polignac number, because 51122405 - 2⁶ = 51122341 is a prime.

It is a super-2 number, since 2×51122405² = 5227000585968050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7649 + ... + 12678.

It is an arithmetic number, because the mean of its divisors is an integer number (7683984).

Almost surely, 2^51122405 is an apocalyptic number.

It is an amenable number.

51122405 is a deficient number, since it is larger than the sum of its proper divisors (10349467).

51122405 is a wasteful number, since it uses less digits than its factorization.

51122405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20835.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51122405 is about 7149.9933566403. The cubic root of 51122405 is about 371.1394263843.

The spelling of 51122405 in words is "fifty-one million, one hundred twenty-two thousand, four hundred five".