1405157161 has 4 divisors (see below), whose sum is σ = 1405519812. Its totient is φ = 1404794512.

The previous prime is 1405157129. The next prime is 1405157191. The reversal of 1405157161 is 1617515041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1092963600 + 312193561 = 33060^2 + 17669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405157161 - 2⁵ = 1405157129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405157111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175450 + ... + 183283.

It is an arithmetic number, because the mean of its divisors is an integer number (351379953).

Almost surely, 2^1405157161 is an apocalyptic number.

It is an amenable number.

1405157161 is a deficient number, since it is larger than the sum of its proper divisors (362651).

1405157161 is an equidigital number, since it uses as much as digits as its factorization.

1405157161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362650.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 1405157161 is about 37485.4259813064. The cubic root of 1405157161 is about 1120.0608919381.

The spelling of 1405157161 in words is "one billion, four hundred five million, one hundred fifty-seven thousand, one hundred sixty-one".