51869415 has 32 divisors (see below), whose sum is σ = 89724096. Its totient is φ = 25436160.

The previous prime is 51869407. The next prime is 51869423. The reversal of 51869415 is 51496815.

It is an interprime number because it is at equal distance from previous prime (51869407) and next prime (51869423).

It is not a de Polignac number, because 51869415 - 2³ = 51869407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89607 + ... + 90183.

It is an arithmetic number, because the mean of its divisors is an integer number (2803878).

Almost surely, 2^51869415 is an apocalyptic number.

51869415 is a deficient number, since it is larger than the sum of its proper divisors (37854681).

51869415 is a wasteful number, since it uses less digits than its factorization.

51869415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its digits is 43200, while the sum is 39.

The square root of 51869415 is about 7202.0424186476. The cubic root of 51869415 is about 372.9384114879.

The spelling of 51869415 in words is "fifty-one million, eight hundred sixty-nine thousand, four hundred fifteen".