1405458661 has 2 divisors, whose sum is σ = 1405458662. Its totient is φ = 1405458660.

The previous prime is 1405458643. The next prime is 1405458667. The reversal of 1405458661 is 1668545041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268428225 + 137030436 = 35615^2 + 11706^2 .

It is an emirp because it is prime and its reverse (1668545041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1405458661 - 2⁷ = 1405458533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405458667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702729330 + 702729331.

It is an arithmetic number, because the mean of its divisors is an integer number (702729331).

Almost surely, 2^1405458661 is an apocalyptic number.

It is an amenable number.

1405458661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405458661 is an equidigital number, since it uses as much as digits as its factorization.

1405458661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 1405458661 is about 37489.4473285483. The cubic root of 1405458661 is about 1120.1409954829.

The spelling of 1405458661 in words is "one billion, four hundred five million, four hundred fifty-eight thousand, six hundred sixty-one".