61937521 has 4 divisors (see below), whose sum is σ = 61953444. Its totient is φ = 61921600.

The previous prime is 61937483. The next prime is 61937527. The reversal of 61937521 is 12573916.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 35569296 + 26368225 = 5964^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 61937521 - 2⁹ = 61937009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61937527) 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, 2181 + ... + 11341.

It is an arithmetic number, because the mean of its divisors is an integer number (15488361).

Almost surely, 2^61937521 is an apocalyptic number.

It is an amenable number.

61937521 is a deficient number, since it is larger than the sum of its proper divisors (15923).

61937521 is an equidigital number, since it uses as much as digits as its factorization.

61937521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15922.

The product of its digits is 11340, while the sum is 34.

The square root of 61937521 is about 7870.0394535225. The cubic root of 61937521 is about 395.6561673005.

The spelling of 61937521 in words is "sixty-one million, nine hundred thirty-seven thousand, five hundred twenty-one".