1340625161 has 4 divisors (see below), whose sum is σ = 1411184400. Its totient is φ = 1270065924.

The previous prime is 1340625157. The next prime is 1340625191. The reversal of 1340625161 is 1615260431.

It is a happy number.

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 1340625161 - 2² = 1340625157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340625191) 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, 35279591 + ... + 35279628.

It is an arithmetic number, because the mean of its divisors is an integer number (352796100).

Almost surely, 2^1340625161 is an apocalyptic number.

It is an amenable number.

1340625161 is a deficient number, since it is larger than the sum of its proper divisors (70559239).

1340625161 is an equidigital number, since it uses as much as digits as its factorization.

1340625161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70559238.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1340625161 is about 36614.5484882717. The cubic root of 1340625161 is about 1102.6451934523.

Adding to 1340625161 its reverse (1615260431), we get a palindrome (2955885592).

The spelling of 1340625161 in words is "one billion, three hundred forty million, six hundred twenty-five thousand, one hundred sixty-one".