1818271157 has 16 divisors (see below), whose sum is σ = 1894641840. Its totient is φ = 1743667200.

The previous prime is 1818271151. The next prime is 1818271171. The reversal of 1818271157 is 7511728181.

It can be written as a sum of positive squares in 8 ways, for example, as 463368676 + 1354902481 = 21526^2 + 36809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818271157 - 2¹⁴ = 1818254773 is a prime.

It is a super-2 number, since 2×1818271157² = 6612220000756237298, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818271151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659093 + ... + 661845.

It is an arithmetic number, because the mean of its divisors is an integer number (118415115).

Almost surely, 2^1818271157 is an apocalyptic number.

It is an amenable number.

1818271157 is a deficient number, since it is larger than the sum of its proper divisors (76370683).

1818271157 is a wasteful number, since it uses less digits than its factorization.

1818271157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064.

The product of its digits is 31360, while the sum is 41.

The square root of 1818271157 is about 42641.1908487556. The cubic root of 1818271157 is about 1220.5424348155.

The spelling of 1818271157 in words is "one billion, eight hundred eighteen million, two hundred seventy-one thousand, one hundred fifty-seven".