1494978881 has 16 divisors (see below), whose sum is σ = 1722651840. Its totient is φ = 1283094720.

The previous prime is 1494978869. The next prime is 1494978917. The reversal of 1494978881 is 1888794941.

It is a cyclic number.

It is not a de Polignac number, because 1494978881 - 2¹⁰ = 1494977857 is a prime.

It is a super-2 number, since 2×1494978881² = 4469923709272024322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1494978881.

It is not an unprimeable number, because it can be changed into a prime (1494978851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49031 + ... + 73443.

It is an arithmetic number, because the mean of its divisors is an integer number (107665740).

Almost surely, 2^1494978881 is an apocalyptic number.

1494978881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1494978881 is a deficient number, since it is larger than the sum of its proper divisors (227672959).

1494978881 is a wasteful number, since it uses less digits than its factorization.

1494978881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24736.

The product of its digits is 4644864, while the sum is 59.

The square root of 1494978881 is about 38664.9567567326. The cubic root of 1494978881 is about 1143.4355377209.

The spelling of 1494978881 in words is "one billion, four hundred ninety-four million, nine hundred seventy-eight thousand, eight hundred eighty-one".