461620861531 has 2 divisors, whose sum is σ = 461620861532. Its totient is φ = 461620861530.

The previous prime is 461620861529. The next prime is 461620861591. The reversal of 461620861531 is 135168026164.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 461620861531 - 2¹ = 461620861529 is a prime.

It is a super-2 number, since 2×461620861531² (a number of 24 digits) contains 22 as substring.

Together with 461620861529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (461620861501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230810430765 + 230810430766.

It is an arithmetic number, because the mean of its divisors is an integer number (230810430766).

Almost surely, 2^461620861531 is an apocalyptic number.

461620861531 is a deficient number, since it is larger than the sum of its proper divisors (1).

461620861531 is an equidigital number, since it uses as much as digits as its factorization.

461620861531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

Adding to 461620861531 its reverse (135168026164), we get a palindrome (596788887695).

The spelling of 461620861531 in words is "four hundred sixty-one billion, six hundred twenty million, eight hundred sixty-one thousand, five hundred thirty-one".