51981441 has 4 divisors (see below), whose sum is σ = 69308592. Its totient is φ = 34654292.

The previous prime is 51981439. The next prime is 51981467. The reversal of 51981441 is 14418915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51981441 - 2¹ = 51981439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51981431) 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, 8663571 + ... + 8663576.

It is an arithmetic number, because the mean of its divisors is an integer number (17327148).

Almost surely, 2^51981441 is an apocalyptic number.

It is an amenable number.

51981441 is a deficient number, since it is larger than the sum of its proper divisors (17327151).

51981441 is a wasteful number, since it uses less digits than its factorization.

51981441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17327150.

The product of its digits is 5760, while the sum is 33.

The square root of 51981441 is about 7209.8156009707. The cubic root of 51981441 is about 373.2067054783.

The spelling of 51981441 in words is "fifty-one million, nine hundred eighty-one thousand, four hundred forty-one".