51211385 has 8 divisors (see below), whose sum is σ = 61822656. Its totient is φ = 40723120.

The previous prime is 51211379. The next prime is 51211387. The reversal of 51211385 is 58311215.

It is a happy number.

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

It is not a de Polignac number, because 51211385 - 2²² = 47017081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51211387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29831 + ... + 31500.

It is an arithmetic number, because the mean of its divisors is an integer number (7727832).

Almost surely, 2^51211385 is an apocalyptic number.

It is an amenable number.

51211385 is a deficient number, since it is larger than the sum of its proper divisors (10611271).

51211385 is a wasteful number, since it uses less digits than its factorization.

51211385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61503.

The product of its digits is 1200, while the sum is 26.

The square root of 51211385 is about 7156.2130348390. The cubic root of 51211385 is about 371.3546278205.

The spelling of 51211385 in words is "fifty-one million, two hundred eleven thousand, three hundred eighty-five".