1231720157347 has 8 divisors (see below), whose sum is σ = 1251941120640. Its totient is φ = 1211500124160.

The previous prime is 1231720157321. The next prime is 1231720157387. The reversal of 1231720157347 is 7437510271321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231720157347 - 2²³ = 1231711768739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231720157387) 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, 2748963 + ... + 3165475.

It is an arithmetic number, because the mean of its divisors is an integer number (156492640080).

Almost surely, 2^{1231720157347} is an apocalyptic number.

1231720157347 is a deficient number, since it is larger than the sum of its proper divisors (20220963293).

1231720157347 is an equidigital number, since it uses as much as digits as its factorization.

1231720157347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465053.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 1231720157347 in words is "one trillion, two hundred thirty-one billion, seven hundred twenty million, one hundred fifty-seven thousand, three hundred forty-seven".