51388897 has 12 divisors (see below), whose sum is σ = 60314436. Its totient is φ = 43653120.

The previous prime is 51388891. The next prime is 51388903. The reversal of 51388897 is 79888315.

It is an interprime number because it is at equal distance from previous prime (51388891) and next prime (51388903).

It can be written as a sum of positive squares in 2 ways, for example, as 20575296 + 30813601 = 4536^2 + 5551^2 .

It is not a de Polignac number, because 51388897 - 2³ = 51388889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 51388897.

It is not an unprimeable number, because it can be changed into a prime (51388891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897 + ... + 10177.

It is an arithmetic number, because the mean of its divisors is an integer number (5026203).

Almost surely, 2^51388897 is an apocalyptic number.

It is an amenable number.

51388897 is a deficient number, since it is larger than the sum of its proper divisors (8925539).

51388897 is a wasteful number, since it uses less digits than its factorization.

51388897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9408 (or 9401 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The square root of 51388897 is about 7168.6049549407. The cubic root of 51388897 is about 371.7832036398.

The spelling of 51388897 in words is "fifty-one million, three hundred eighty-eight thousand, eight hundred ninety-seven".