51431004 has 48 divisors (see below), whose sum is σ = 133758240. Its totient is φ = 17089920.

The previous prime is 51430963. The next prime is 51431011. The reversal of 51431004 is 40013415.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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, 49272 + ... + 50304.

It is an arithmetic number, because the mean of its divisors is an integer number (2786630).

Almost surely, 2^51431004 is an apocalyptic number.

51431004 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51431004 is an abundant number, since it is smaller than the sum of its proper divisors (82327236).

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

51431004 is a wasteful number, since it uses less digits than its factorization.

51431004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51431004 is about 7171.5412569405. The cubic root of 51431004 is about 371.8847197422.

Adding to 51431004 its reverse (40013415), we get a palindrome (91444419).

The spelling of 51431004 in words is "fifty-one million, four hundred thirty-one thousand, four".