1494723862921 has 9 divisors (see below), whose sum is σ = 1587842929749. Its totient is φ = 1406779368384.

The previous prime is 1494723862787. The next prime is 1494723862939. The reversal of 1494723862921 is 1292683274941.

The square root of 1494723862921 is 1222589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5396518521 + 1489327344400 = 73461^2 + 1220380^2 .

It is not a de Polignac number, because 1494723862921 - 2²¹ = 1494721765769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1494723862421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20748055 + ... + 20819971.

Almost surely, 2^{1494723862921} is an apocalyptic number.

1494723862921 is the 1222589-th square number.

1494723862921 is the 611295-th centered octagonal number.

It is an amenable number.

1494723862921 is a deficient number, since it is larger than the sum of its proper divisors (93119066828).

1494723862921 is an frugal number, since it uses more digits than its factorization.

1494723862921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143868 (or 71934 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 58.

The spelling of 1494723862921 in words is "one trillion, four hundred ninety-four billion, seven hundred twenty-three million, eight hundred sixty-two thousand, nine hundred twenty-one".