61322521 has 4 divisors (see below), whose sum is σ = 66039652. Its totient is φ = 56605392.

The previous prime is 61322497. The next prime is 61322533. The reversal of 61322521 is 12522316.

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 12880921 + 48441600 = 3589^2 + 6960^2 .

It is a cyclic number.

It is not a de Polignac number, because 61322521 - 2¹¹ = 61320473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61322492 and 61322501.

It is not an unprimeable number, because it can be changed into a prime (61322551) 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, 2358546 + ... + 2358571.

It is an arithmetic number, because the mean of its divisors is an integer number (16509913).

Almost surely, 2^61322521 is an apocalyptic number.

It is an amenable number.

61322521 is a deficient number, since it is larger than the sum of its proper divisors (4717131).

61322521 is a wasteful number, since it uses less digits than its factorization.

61322521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717130.

The product of its digits is 720, while the sum is 22.

The square root of 61322521 is about 7830.8697473525. The cubic root of 61322521 is about 394.3422713138.

Adding to 61322521 its reverse (12522316), we get a palindrome (73844837).

The spelling of 61322521 in words is "sixty-one million, three hundred twenty-two thousand, five hundred twenty-one".