1494178561 has 2 divisors, whose sum is σ = 1494178562. Its totient is φ = 1494178560.

The previous prime is 1494178541. The next prime is 1494178613. The reversal of 1494178561 is 1658714941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1455041025 + 39137536 = 38145^2 + 6256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1494178561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1494178541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747089280 + 747089281.

It is an arithmetic number, because the mean of its divisors is an integer number (747089281).

Almost surely, 2^1494178561 is an apocalyptic number.

It is an amenable number.

1494178561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1494178561 is an equidigital number, since it uses as much as digits as its factorization.

1494178561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 1494178561 is about 38654.6059480626. The cubic root of 1494178561 is about 1143.2314595477.

The spelling of 1494178561 in words is "one billion, four hundred ninety-four million, one hundred seventy-eight thousand, five hundred sixty-one".