61214521 has 2 divisors, whose sum is σ = 61214522. Its totient is φ = 61214520.

The previous prime is 61214519. The next prime is 61214557. The reversal of 61214521 is 12541216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47114496 + 14100025 = 6864^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 61214521 - 2¹ = 61214519 is a prime.

Together with 61214519, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 61214492 and 61214501.

It is not a weakly prime, because it can be changed into another prime (61214591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30607260 + 30607261.

It is an arithmetic number, because the mean of its divisors is an integer number (30607261).

Almost surely, 2^61214521 is an apocalyptic number.

It is an amenable number.

61214521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61214521 is an equidigital number, since it uses as much as digits as its factorization.

61214521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 61214521 is about 7823.9709227476. The cubic root of 61214521 is about 394.1106326957.

Adding to 61214521 its reverse (12541216), we get a palindrome (73755737).

The spelling of 61214521 in words is "sixty-one million, two hundred fourteen thousand, five hundred twenty-one".