1213607738837 has 4 divisors (see below), whose sum is σ = 1306962180300. Its totient is φ = 1120253297376.

The previous prime is 1213607738821. The next prime is 1213607738911. The reversal of 1213607738837 is 7388377063121.

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 593379036721 + 620228702116 = 770311^2 + 787546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213607738837 - 2⁴ = 1213607738821 is a prime.

It is a super-2 number, since 2×1213607738837² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213607738137) 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, 46677220712 + ... + 46677220737.

It is an arithmetic number, because the mean of its divisors is an integer number (326740545075).

Almost surely, 2^{1213607738837} is an apocalyptic number.

It is an amenable number.

1213607738837 is a deficient number, since it is larger than the sum of its proper divisors (93354441463).

1213607738837 is an equidigital number, since it uses as much as digits as its factorization.

1213607738837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93354441462.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 1213607738837 in words is "one trillion, two hundred thirteen billion, six hundred seven million, seven hundred thirty-eight thousand, eight hundred thirty-seven".