1361871157 has 4 divisors (see below), whose sum is σ = 1362031020. Its totient is φ = 1361711296.

The previous prime is 1361871149. The next prime is 1361871187. The reversal of 1361871157 is 7511781631.

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 1356154276 + 5716881 = 36826^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361871157 - 2³ = 1361871149 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361871187) 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, 66388 + ... + 84445.

It is an arithmetic number, because the mean of its divisors is an integer number (340507755).

Almost surely, 2^1361871157 is an apocalyptic number.

It is an amenable number.

1361871157 is a deficient number, since it is larger than the sum of its proper divisors (159863).

1361871157 is an equidigital number, since it uses as much as digits as its factorization.

1361871157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159862.

The product of its digits is 35280, while the sum is 40.

The square root of 1361871157 is about 36903.5385430720. The cubic root of 1361871157 is about 1108.4395346906.

The spelling of 1361871157 in words is "one billion, three hundred sixty-one million, eight hundred seventy-one thousand, one hundred fifty-seven".