51156005 has 4 divisors (see below), whose sum is σ = 61387212. Its totient is φ = 40924800.

The previous prime is 51155969. The next prime is 51156011. The reversal of 51156005 is 50065115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8567329 + 42588676 = 2927^2 + 6526^2 .

It is not a de Polignac number, because 51156005 - 2¹² = 51151909 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 5115596 + ... + 5115605.

It is an arithmetic number, because the mean of its divisors is an integer number (15346803).

Almost surely, 2^51156005 is an apocalyptic number.

It is an amenable number.

51156005 is a deficient number, since it is larger than the sum of its proper divisors (10231207).

51156005 is a wasteful number, since it uses less digits than its factorization.

51156005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10231206.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 51156005 is about 7152.3426232249. The cubic root of 51156005 is about 371.2207185543.

The spelling of 51156005 in words is "fifty-one million, one hundred fifty-six thousand, five".