1225731273157 has 4 divisors (see below), whose sum is σ = 1226054433100. Its totient is φ = 1225408113216.

The previous prime is 1225731273079. The next prime is 1225731273161. The reversal of 1225731273157 is 7513721375221.

It is a happy number.

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 566345048481 + 659386224676 = 752559^2 + 812026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225731273157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225731273167) 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, 161574282 + ... + 161581867.

It is an arithmetic number, because the mean of its divisors is an integer number (306513608275).

Almost surely, 2^{1225731273157} is an apocalyptic number.

It is an amenable number.

1225731273157 is a deficient number, since it is larger than the sum of its proper divisors (323159943).

1225731273157 is an equidigital number, since it uses as much as digits as its factorization.

1225731273157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323159942.

The product of its digits is 617400, while the sum is 46.

The spelling of 1225731273157 in words is "one trillion, two hundred twenty-five billion, seven hundred thirty-one million, two hundred seventy-three thousand, one hundred fifty-seven".