51155973 has 12 divisors (see below), whose sum is σ = 80609568. Its totient is φ = 31003560.

The previous prime is 51155969. The next prime is 51156011. The reversal of 51155973 is 37955115.

51155973 is a `hidden beast` number, since 51 + 15 + 597 + 3 = 666.

It is not a de Polignac number, because 51155973 - 2² = 51155969 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258265 + ... + 258462.

It is an arithmetic number, because the mean of its divisors is an integer number (6717464).

Almost surely, 2^51155973 is an apocalyptic number.

It is an amenable number.

51155973 is a deficient number, since it is larger than the sum of its proper divisors (29453595).

51155973 is a wasteful number, since it uses less digits than its factorization.

51155973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516744 (or 516741 counting only the distinct ones).

The product of its digits is 23625, while the sum is 36.

The square root of 51155973 is about 7152.3403861953. The cubic root of 51155973 is about 371.2206411501.

The spelling of 51155973 in words is "fifty-one million, one hundred fifty-five thousand, nine hundred seventy-three".