30478138631 has 2 divisors, whose sum is σ = 30478138632. Its totient is φ = 30478138630.

The previous prime is 30478138601. The next prime is 30478138673. The reversal of 30478138631 is 13683187403.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30478138631 - 2⁶ = 30478138567 is a prime.

It is a super-2 number, since 2×30478138631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30478138601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15239069315 + 15239069316.

It is an arithmetic number, because the mean of its divisors is an integer number (15239069316).

Almost surely, 2^30478138631 is an apocalyptic number.

30478138631 is a deficient number, since it is larger than the sum of its proper divisors (1).

30478138631 is an equidigital number, since it uses as much as digits as its factorization.

30478138631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 30478138631 in words is "thirty billion, four hundred seventy-eight million, one hundred thirty-eight thousand, six hundred thirty-one".