425617531 has 2 divisors, whose sum is σ = 425617532. Its totient is φ = 425617530.

The previous prime is 425617529. The next prime is 425617573. The reversal of 425617531 is 135716524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 425617531 - 2¹ = 425617529 is a prime.

It is a super-2 number, since 2×425617531² = 362300565389071922, which contains 22 as substring.

Together with 425617529, it forms a pair of twin primes.

It is the 20631-st Hogben number.

It is not a weakly prime, because it can be changed into another prime (425617501) by changing a digit.

It is a nontrivial repunit in base 20630.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212808765 + 212808766.

It is an arithmetic number, because the mean of its divisors is an integer number (212808766).

Almost surely, 2^425617531 is an apocalyptic number.

425617531 is a deficient number, since it is larger than the sum of its proper divisors (1).

425617531 is an equidigital number, since it uses as much as digits as its factorization.

425617531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 425617531 is about 20630.5000181770. The cubic root of 425617531 is about 752.2112701200.

The spelling of 425617531 in words is "four hundred twenty-five million, six hundred seventeen thousand, five hundred thirty-one".