51217002 has 32 divisors (see below), whose sum is σ = 114125760. Its totient is φ = 17025840.

The previous prime is 51216973. The next prime is 51217009. The reversal of 51217002 is 20071215.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51217009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22852 + ... + 24992.

It is an arithmetic number, because the mean of its divisors is an integer number (3566430).

Almost surely, 2^51217002 is an apocalyptic number.

51217002 is an abundant number, since it is smaller than the sum of its proper divisors (62908758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51217002 is a wasteful number, since it uses less digits than its factorization.

51217002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2589 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51217002 is about 7156.6054802539. The cubic root of 51217002 is about 371.3682043764.

Adding to 51217002 its reverse (20071215), we get a palindrome (71288217).

The spelling of 51217002 in words is "fifty-one million, two hundred seventeen thousand, two".