51197365 has 4 divisors (see below), whose sum is σ = 61436844. Its totient is φ = 40957888.

The previous prime is 51197351. The next prime is 51197369. The reversal of 51197365 is 56379115.

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 23561316 + 27636049 = 4854^2 + 5257^2 .

It is a cyclic number.

It is not a de Polignac number, because 51197365 - 2⁹ = 51196853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51197369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5119732 + ... + 5119741.

It is an arithmetic number, because the mean of its divisors is an integer number (15359211).

Almost surely, 2^51197365 is an apocalyptic number.

It is an amenable number.

51197365 is a deficient number, since it is larger than the sum of its proper divisors (10239479).

51197365 is a wasteful number, since it uses less digits than its factorization.

51197365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10239478.

The product of its digits is 28350, while the sum is 37.

The square root of 51197365 is about 7155.2333994077. The cubic root of 51197365 is about 371.3207364826.

The spelling of 51197365 in words is "fifty-one million, one hundred ninety-seven thousand, three hundred sixty-five".