51739261 has 16 divisors (see below), whose sum is σ = 63107200. Its totient is φ = 41438304.

The previous prime is 51739243. The next prime is 51739267. The reversal of 51739261 is 16293715.

It is not a de Polignac number, because 51739261 - 2⁵ = 51739229 is a prime.

It is a super-2 number, since 2×51739261² = 5353902257652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51739267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708721 + ... + 708793.

It is an arithmetic number, because the mean of its divisors is an integer number (3944200).

Almost surely, 2^51739261 is an apocalyptic number.

It is an amenable number.

51739261 is a deficient number, since it is larger than the sum of its proper divisors (11367939).

51739261 is an frugal number, since it uses more digits than its factorization.

51739261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 99 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 51739261 is about 7193.0008341443. Note that the first 3 decimals coincide. The cubic root of 51739261 is about 372.6262167061.

The spelling of 51739261 in words is "fifty-one million, seven hundred thirty-nine thousand, two hundred sixty-one".