51531433 has 2 divisors, whose sum is σ = 51531434. Its totient is φ = 51531432.

The previous prime is 51531427. The next prime is 51531451. The reversal of 51531433 is 33413515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43930384 + 7601049 = 6628^2 + 2757^2 .

It is a cyclic number.

It is not a de Polignac number, because 51531433 - 2¹⁷ = 51400361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51531398 and 51531407.

It is not a weakly prime, because it can be changed into another prime (51531413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765716 + 25765717.

It is an arithmetic number, because the mean of its divisors is an integer number (25765717).

Almost surely, 2^51531433 is an apocalyptic number.

It is an amenable number.

51531433 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531433 is an equidigital number, since it uses as much as digits as its factorization.

51531433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 51531433 is about 7178.5397540168. The cubic root of 51531433 is about 372.1266213464.

Adding to 51531433 its reverse (33413515), we get a palindrome (84944948).

The spelling of 51531433 in words is "fifty-one million, five hundred thirty-one thousand, four hundred thirty-three".