30631779406389 has 32 divisors (see below), whose sum is σ = 47328004373760. Its totient is φ = 17260800809472.

The previous prime is 30631779406373. The next prime is 30631779406391. The reversal of 30631779406389 is 98360497713603.

It is a happy number.

It is not a de Polignac number, because 30631779406389 - 2⁴ = 30631779406373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30631779406589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21272562 + ... + 22666835.

It is an arithmetic number, because the mean of its divisors is an integer number (1479000136680).

Almost surely, 2^{30631779406389} is an apocalyptic number.

It is an amenable number.

30631779406389 is a deficient number, since it is larger than the sum of its proper divisors (16696224967371).

30631779406389 is a wasteful number, since it uses less digits than its factorization.

30631779406389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43939869.

The product of its (nonzero) digits is 123451776, while the sum is 66.

The spelling of 30631779406389 in words is "thirty trillion, six hundred thirty-one billion, seven hundred seventy-nine million, four hundred six thousand, three hundred eighty-nine".