1812771274 has 4 divisors (see below), whose sum is σ = 2719156914. Its totient is φ = 906385636.

The previous prime is 1812771271. The next prime is 1812771277. The reversal of 1812771274 is 4721772181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4721772181 = 7 ⋅674538883.

It is an interprime number because it is at equal distance from previous prime (1812771271) and next prime (1812771277).

It can be written as a sum of positive squares in only one way, i.e., 1138590049 + 674181225 = 33743^2 + 25965^2 .

It is a super-2 number, since 2×1812771274² = 6572279383679166152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1812771271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453192817 + ... + 453192820.

Almost surely, 2^1812771274 is an apocalyptic number.

1812771274 is a deficient number, since it is larger than the sum of its proper divisors (906385640).

1812771274 is an equidigital number, since it uses as much as digits as its factorization.

1812771274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906385639.

The product of its digits is 43904, while the sum is 40.

The square root of 1812771274 is about 42576.6517471724. The cubic root of 1812771274 is about 1219.3105649588.

It can be divided in two parts, 18127 and 71274, that added together give a square (89401 = 299²).

The spelling of 1812771274 in words is "one billion, eight hundred twelve million, seven hundred seventy-one thousand, two hundred seventy-four".