1405173661 has 4 divisors (see below), whose sum is σ = 1466268192. Its totient is φ = 1344079132.

The previous prime is 1405173659. The next prime is 1405173667. The reversal of 1405173661 is 1663715041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1405173661 - 2¹ = 1405173659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405173667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30547231 + ... + 30547276.

It is an arithmetic number, because the mean of its divisors is an integer number (366567048).

Almost surely, 2^1405173661 is an apocalyptic number.

It is an amenable number.

1405173661 is a deficient number, since it is larger than the sum of its proper divisors (61094531).

1405173661 is an equidigital number, since it uses as much as digits as its factorization.

1405173661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61094530.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1405173661 is about 37485.6460661945. The cubic root of 1405173661 is about 1120.0652760106.

The spelling of 1405173661 in words is "one billion, four hundred five million, one hundred seventy-three thousand, six hundred sixty-one".