61163621 has 4 divisors (see below), whose sum is σ = 61211244. Its totient is φ = 61116000.

The previous prime is 61163593. The next prime is 61163657. The reversal of 61163621 is 12636116.

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 40132225 + 21031396 = 6335^2 + 4586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61163621 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 (61163321) 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, 21830 + ... + 24471.

It is an arithmetic number, because the mean of its divisors is an integer number (15302811).

Almost surely, 2^61163621 is an apocalyptic number.

It is an amenable number.

61163621 is a deficient number, since it is larger than the sum of its proper divisors (47623).

61163621 is a wasteful number, since it uses less digits than its factorization.

61163621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47622.

The product of its digits is 1296, while the sum is 26.

The square root of 61163621 is about 7820.7174223341. The cubic root of 61163621 is about 394.0013678051.

Adding to 61163621 its reverse (12636116), we get a palindrome (73799737).

The spelling of 61163621 in words is "sixty-one million, one hundred sixty-three thousand, six hundred twenty-one".