61504213 has 2 divisors, whose sum is σ = 61504214. Its totient is φ = 61504212.

The previous prime is 61504211. The next prime is 61504229. The reversal of 61504213 is 31240516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56205009 + 5299204 = 7497^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 61504213 - 2¹ = 61504211 is a prime.

Together with 61504211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61504211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752106 + 30752107.

It is an arithmetic number, because the mean of its divisors is an integer number (30752107).

Almost surely, 2^61504213 is an apocalyptic number.

It is an amenable number.

61504213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61504213 is an equidigital number, since it uses as much as digits as its factorization.

61504213 is an evil number, because the sum of its binary digits is even.

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

The square root of 61504213 is about 7842.4621771482. The cubic root of 61504213 is about 394.7313518042.

Adding to 61504213 its reverse (31240516), we get a palindrome (92744729).

The spelling of 61504213 in words is "sixty-one million, five hundred four thousand, two hundred thirteen".