51531402 has 16 divisors (see below), whose sum is σ = 110990880. Its totient is φ = 15855792.

The previous prime is 51531377. The next prime is 51531407. The reversal of 51531402 is 20413515.

It is not an unprimeable number, because it can be changed into a prime (51531407) 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 7 ways as a sum of consecutive naturals, for example, 330252 + ... + 330407.

It is an arithmetic number, because the mean of its divisors is an integer number (6936930).

Almost surely, 2^51531402 is an apocalyptic number.

51531402 is an abundant number, since it is smaller than the sum of its proper divisors (59459478).

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

51531402 is a wasteful number, since it uses less digits than its factorization.

51531402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660677.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51531402 is about 7178.5375948030. The cubic root of 51531402 is about 372.1265467257.

Adding to 51531402 its reverse (20413515), we get a palindrome (71944917).

It can be divided in two parts, 5153 and 1402, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 51531402 in words is "fifty-one million, five hundred thirty-one thousand, four hundred two".