61353521 has 2 divisors, whose sum is σ = 61353522. Its totient is φ = 61353520.

The previous prime is 61353497. The next prime is 61353529. The reversal of 61353521 is 12535316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58308496 + 3045025 = 7636^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 61353521 - 2²² = 57159217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61353529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30676760 + 30676761.

It is an arithmetic number, because the mean of its divisors is an integer number (30676761).

Almost surely, 2^61353521 is an apocalyptic number.

It is an amenable number.

61353521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61353521 is an equidigital number, since it uses as much as digits as its factorization.

61353521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 61353521 is about 7832.8488431732. The cubic root of 61353521 is about 394.4087099340.

Adding to 61353521 its reverse (12535316), we get a palindrome (73888837).

The spelling of 61353521 in words is "sixty-one million, three hundred fifty-three thousand, five hundred twenty-one".