51155746 has 4 divisors (see below), whose sum is σ = 76733622. Its totient is φ = 25577872.

The previous prime is 51155743. The next prime is 51155761. The reversal of 51155746 is 64755115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 24890121 = 5125^2 + 4989^2 .

It is not an unprimeable number, because it can be changed into a prime (51155743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12788935 + ... + 12788938.

Almost surely, 2^51155746 is an apocalyptic number.

51155746 is a deficient number, since it is larger than the sum of its proper divisors (25577876).

51155746 is a wasteful number, since it uses less digits than its factorization.

51155746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25577875.

The product of its digits is 21000, while the sum is 34.

The square root of 51155746 is about 7152.3245172461. The cubic root of 51155746 is about 371.2200920633.

The spelling of 51155746 in words is "fifty-one million, one hundred fifty-five thousand, seven hundred forty-six".