51771261 has 8 divisors (see below), whose sum is σ = 70198560. Its totient is φ = 33929072.

The previous prime is 51771253. The next prime is 51771263. The reversal of 51771261 is 16217715.

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

It is a cyclic number.

It is not a de Polignac number, because 51771261 - 2³ = 51771253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51771263) 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, 146070 + ... + 146423.

It is an arithmetic number, because the mean of its divisors is an integer number (8774820).

Almost surely, 2^51771261 is an apocalyptic number.

It is an amenable number.

51771261 is a deficient number, since it is larger than the sum of its proper divisors (18427299).

51771261 is a wasteful number, since it uses less digits than its factorization.

51771261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292555.

The product of its digits is 2940, while the sum is 30.

The square root of 51771261 is about 7195.2248748736. The cubic root of 51771261 is about 372.7030222194.

Adding to 51771261 its reverse (16217715), we get a palindrome (67988976).

The spelling of 51771261 in words is "fifty-one million, seven hundred seventy-one thousand, two hundred sixty-one".