61521301 has 2 divisors, whose sum is σ = 61521302. Its totient is φ = 61521300.

The previous prime is 61521281. The next prime is 61521307. The reversal of 61521301 is 10312516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34751025 + 26770276 = 5895^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 61521301 - 2¹¹ = 61519253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61521307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760650 + 30760651.

It is an arithmetic number, because the mean of its divisors is an integer number (30760651).

Almost surely, 2^61521301 is an apocalyptic number.

It is an amenable number.

61521301 is a deficient number, since it is larger than the sum of its proper divisors (1).

61521301 is an equidigital number, since it uses as much as digits as its factorization.

61521301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 61521301 is about 7843.5515552586. The cubic root of 61521301 is about 394.7679050983.

Adding to 61521301 its reverse (10312516), we get a palindrome (71833817).

The spelling of 61521301 in words is "sixty-one million, five hundred twenty-one thousand, three hundred one".