1491646441 has 2 divisors, whose sum is σ = 1491646442. Its totient is φ = 1491646440.

The previous prime is 1491646421. The next prime is 1491646451. The reversal of 1491646441 is 1446461941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1414136025 + 77510416 = 37605^2 + 8804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491646441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1491646394 and 1491646403.

It is not a weakly prime, because it can be changed into another prime (1491646411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745823220 + 745823221.

It is an arithmetic number, because the mean of its divisors is an integer number (745823221).

Almost surely, 2^1491646441 is an apocalyptic number.

It is an amenable number.

1491646441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491646441 is an equidigital number, since it uses as much as digits as its factorization.

1491646441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 1491646441 is about 38621.8389127188. The cubic root of 1491646441 is about 1142.5852993786.

The spelling of 1491646441 in words is "one billion, four hundred ninety-one million, six hundred forty-six thousand, four hundred forty-one".