61505321 has 4 divisors (see below), whose sum is σ = 62069700. Its totient is φ = 60940944.

The previous prime is 61505309. The next prime is 61505363. The reversal of 61505321 is 12350516.

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 30858025 + 30647296 = 5555^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 61505321 - 2¹⁰ = 61504297 is a prime.

It is a super-2 number, since 2×61505321² = 7565809022626082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61505021) 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, 282026 + ... + 282243.

It is an arithmetic number, because the mean of its divisors is an integer number (15517425).

Almost surely, 2^61505321 is an apocalyptic number.

It is an amenable number.

61505321 is a deficient number, since it is larger than the sum of its proper divisors (564379).

61505321 is a wasteful number, since it uses less digits than its factorization.

61505321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564378.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 61505321 is about 7842.5328179103. The cubic root of 61505321 is about 394.7337221551.

Adding to 61505321 its reverse (12350516), we get a palindrome (73855837).

The spelling of 61505321 in words is "sixty-one million, five hundred five thousand, three hundred twenty-one".