42878787133531 has 2 divisors, whose sum is σ = 42878787133532. Its totient is φ = 42878787133530.

The previous prime is 42878787133493. The next prime is 42878787133541. The reversal of 42878787133531 is 13533178787824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42878787133531 - 2⁹ = 42878787133019 is a prime.

It is a super-2 number, since 2×42878787133531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42878787133541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439393566765 + 21439393566766.

It is an arithmetic number, because the mean of its divisors is an integer number (21439393566766).

Almost surely, 2^{42878787133531} is an apocalyptic number.

42878787133531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878787133531 is an equidigital number, since it uses as much as digits as its factorization.

42878787133531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189665280, while the sum is 67.

The spelling of 42878787133531 in words is "forty-two trillion, eight hundred seventy-eight billion, seven hundred eighty-seven million, one hundred thirty-three thousand, five hundred thirty-one".