42131513 has 2 divisors, whose sum is σ = 42131514. Its totient is φ = 42131512.

The previous prime is 42131503. The next prime is 42131521. The reversal of 42131513 is 31513124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33790969 + 8340544 = 5813^2 + 2888^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131513 - 2⁴ = 42131497 is a prime.

It is not a weakly prime, because it can be changed into another prime (42131503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065756 + 21065757.

It is an arithmetic number, because the mean of its divisors is an integer number (21065757).

Almost surely, 2^42131513 is an apocalyptic number.

It is an amenable number.

42131513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131513 is an equidigital number, since it uses as much as digits as its factorization.

42131513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 42131513 is about 6490.8792162541. The cubic root of 42131513 is about 347.9650981204.

Adding to 42131513 its reverse (31513124), we get a palindrome (73644637).

The spelling of 42131513 in words is "forty-two million, one hundred thirty-one thousand, five hundred thirteen".