1291620781304 has 32 divisors (see below), whose sum is σ = 2771847168480. Its totient is φ = 552734093184.

The previous prime is 1291620781301. The next prime is 1291620781349. The reversal of 1291620781304 is 4031870261921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291620781301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16996547 + ... + 17072370.

It is an arithmetic number, because the mean of its divisors is an integer number (86620224015).

Almost surely, 2^{1291620781304} is an apocalyptic number.

1291620781304 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1291620781304 is an abundant number, since it is smaller than the sum of its proper divisors (1480226387176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291620781304 is a wasteful number, since it uses less digits than its factorization.

1291620781304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34069607 (or 34069603 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 1291620781304 in words is "one trillion, two hundred ninety-one billion, six hundred twenty million, seven hundred eighty-one thousand, three hundred four".