61315161 has 4 divisors (see below), whose sum is σ = 81753552. Its totient is φ = 40876772.

The previous prime is 61315159. The next prime is 61315183. The reversal of 61315161 is 16151316.

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 61315161 - 2¹ = 61315159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61315151) 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, 10219191 + ... + 10219196.

It is an arithmetic number, because the mean of its divisors is an integer number (20438388).

Almost surely, 2^61315161 is an apocalyptic number.

It is an amenable number.

61315161 is a deficient number, since it is larger than the sum of its proper divisors (20438391).

61315161 is a wasteful number, since it uses less digits than its factorization.

61315161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20438390.

The product of its digits is 540, while the sum is 24.

The square root of 61315161 is about 7830.3997982223. The cubic root of 61315161 is about 394.3264942105.

Adding to 61315161 its reverse (16151316), we get a palindrome (77466477).

The spelling of 61315161 in words is "sixty-one million, three hundred fifteen thousand, one hundred sixty-one".