1284720974137 has 4 divisors (see below), whose sum is σ = 1292903910436. Its totient is φ = 1276538037840.

The previous prime is 1284720974123. The next prime is 1284720974161. The reversal of 1284720974137 is 7314790274821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978049793296 + 306671180841 = 988964^2 + 553779^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284720974137 - 2³⁹ = 734965160249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284720974177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091467914 + ... + 4091468227.

It is an arithmetic number, because the mean of its divisors is an integer number (323225977609).

Almost surely, 2^{1284720974137} is an apocalyptic number.

It is an amenable number.

1284720974137 is a deficient number, since it is larger than the sum of its proper divisors (8182936299).

1284720974137 is an equidigital number, since it uses as much as digits as its factorization.

1284720974137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182936298.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 1284720974137 in words is "one trillion, two hundred eighty-four billion, seven hundred twenty million, nine hundred seventy-four thousand, one hundred thirty-seven".