51888869 has 4 divisors (see below), whose sum is σ = 52471980. Its totient is φ = 51305760.

The previous prime is 51888853. The next prime is 51888871. The reversal of 51888869 is 96888815.

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 29920900 + 21967969 = 5470^2 + 4687^2 .

It is a cyclic number.

It is not a de Polignac number, because 51888869 - 2⁴ = 51888853 is a prime.

It is a super-2 number, since 2×51888869² = 5384909452198322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51888869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51888169) 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, 291422 + ... + 291599.

It is an arithmetic number, because the mean of its divisors is an integer number (13117995).

Almost surely, 2^51888869 is an apocalyptic number.

It is an amenable number.

51888869 is a deficient number, since it is larger than the sum of its proper divisors (583111).

51888869 is an equidigital number, since it uses as much as digits as its factorization.

51888869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583110.

The product of its digits is 1105920, while the sum is 53.

The square root of 51888869 is about 7203.3928811359. The cubic root of 51888869 is about 372.9850300782.

The spelling of 51888869 in words is "fifty-one million, eight hundred eighty-eight thousand, eight hundred sixty-nine".