1391630487956 has 6 divisors (see below), whose sum is σ = 2435353353930. Its totient is φ = 695815243976.

The previous prime is 1391630487869. The next prime is 1391630487979. The reversal of 1391630487956 is 6597840361931.

It can be written as a sum of positive squares in only one way, i.e., 949825668100 + 441804819856 = 974590^2 + 664684^2 .

It is a super-2 number, since 2×1391630487956² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173953810991 + ... + 173953810998.

It is an arithmetic number, because the mean of its divisors is an integer number (405892225655).

Almost surely, 2^{1391630487956} is an apocalyptic number.

It is an amenable number.

1391630487956 is a deficient number, since it is larger than the sum of its proper divisors (1043722865974).

1391630487956 is a wasteful number, since it uses less digits than its factorization.

1391630487956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347907621993 (or 347907621991 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 1391630487956 in words is "one trillion, three hundred ninety-one billion, six hundred thirty million, four hundred eighty-seven thousand, nine hundred fifty-six".