1491081853 has 2 divisors, whose sum is σ = 1491081854. Its totient is φ = 1491081852.

The previous prime is 1491081811. The next prime is 1491081857. The reversal of 1491081853 is 3581801941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1145010244 + 346071609 = 33838^2 + 18603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491081853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491081857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745540926 + 745540927.

It is an arithmetic number, because the mean of its divisors is an integer number (745540927).

Almost surely, 2^1491081853 is an apocalyptic number.

It is an amenable number.

1491081853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491081853 is an equidigital number, since it uses as much as digits as its factorization.

1491081853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 1491081853 is about 38614.5290402460. The cubic root of 1491081853 is about 1142.4411250539.

The spelling of 1491081853 in words is "one billion, four hundred ninety-one million, eighty-one thousand, eight hundred fifty-three".