1481621278 has 4 divisors (see below), whose sum is σ = 2222431920. Its totient is φ = 740810638.

The previous prime is 1481621261. The next prime is 1481621321. The reversal of 1481621278 is 8721261841.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1481621278² = 4390403222844706568, which contains 22 as substring.

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 self number, because there is not a number n which added to its sum of digits gives 1481621278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370405318 + ... + 370405321.

It is an arithmetic number, because the mean of its divisors is an integer number (555607980).

Almost surely, 2^1481621278 is an apocalyptic number.

1481621278 is a deficient number, since it is larger than the sum of its proper divisors (740810642).

1481621278 is an equidigital number, since it uses as much as digits as its factorization.

1481621278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740810641.

The product of its digits is 43008, while the sum is 40.

The square root of 1481621278 is about 38491.8339131822. The cubic root of 1481621278 is about 1140.0198206259.

The spelling of 1481621278 in words is "one billion, four hundred eighty-one million, six hundred twenty-one thousand, two hundred seventy-eight".