61520189 has 2 divisors, whose sum is σ = 61520190. Its totient is φ = 61520188.

The previous prime is 61520183. The next prime is 61520191. The reversal of 61520189 is 98102516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46812964 + 14707225 = 6842^2 + 3835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61520189 is a prime.

Together with 61520191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61520183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760094 + 30760095.

It is an arithmetic number, because the mean of its divisors is an integer number (30760095).

Almost surely, 2^61520189 is an apocalyptic number.

It is an amenable number.

61520189 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520189 is an equidigital number, since it uses as much as digits as its factorization.

61520189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 61520189 is about 7843.4806686828. The cubic root of 61520189 is about 394.7655266020.

The spelling of 61520189 in words is "sixty-one million, five hundred twenty thousand, one hundred eighty-nine".