821481274 has 4 divisors (see below), whose sum is σ = 1232221914. Its totient is φ = 410740636.

The previous prime is 821481251. The next prime is 821481277. The reversal of 821481274 is 472184128.

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 only one way, i.e., 640444249 + 181037025 = 25307^2 + 13455^2 .

It is not an unprimeable number, because it can be changed into a prime (821481277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205370317 + ... + 205370320.

Almost surely, 2^821481274 is an apocalyptic number.

821481274 is a deficient number, since it is larger than the sum of its proper divisors (410740640).

821481274 is a wasteful number, since it uses less digits than its factorization.

821481274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410740639.

The product of its digits is 28672, while the sum is 37.

The square root of 821481274 is about 28661.4946225768. The cubic root of 821481274 is about 936.5534240545.

The spelling of 821481274 in words is "eight hundred twenty-one million, four hundred eighty-one thousand, two hundred seventy-four".