51531413 has 2 divisors, whose sum is σ = 51531414. Its totient is φ = 51531412.

The previous prime is 51531407. The next prime is 51531419. The reversal of 51531413 is 31413515.

It is a balanced prime because it is at equal distance from previous prime (51531407) and next prime (51531419).

It can be written as a sum of positive squares in only one way, i.e., 51294244 + 237169 = 7162^2 + 487^2 .

It is a cyclic number.

It is not a de Polignac number, because 51531413 - 2¹⁰ = 51530389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51531419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765706 + 25765707.

It is an arithmetic number, because the mean of its divisors is an integer number (25765707).

Almost surely, 2^51531413 is an apocalyptic number.

It is an amenable number.

51531413 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531413 is an equidigital number, since it uses as much as digits as its factorization.

51531413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 23.

The square root of 51531413 is about 7178.5383609757. The cubic root of 51531413 is about 372.1265732040.

Adding to 51531413 its reverse (31413515), we get a palindrome (82944928).

The spelling of 51531413 in words is "fifty-one million, five hundred thirty-one thousand, four hundred thirteen".