61562509 has 2 divisors, whose sum is σ = 61562510. Its totient is φ = 61562508.

The previous prime is 61562507. The next prime is 61562537. The reversal of 61562509 is 90526516.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48580900 + 12981609 = 6970^2 + 3603^2 .

It is a cyclic number.

It is not a de Polignac number, because 61562509 - 2¹ = 61562507 is a prime.

Together with 61562507, 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 (61562503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30781254 + 30781255.

It is an arithmetic number, because the mean of its divisors is an integer number (30781255).

Almost surely, 2^61562509 is an apocalyptic number.

It is an amenable number.

61562509 is a deficient number, since it is larger than the sum of its proper divisors (1).

61562509 is an equidigital number, since it uses as much as digits as its factorization.

61562509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 61562509 is about 7846.1779867653. The cubic root of 61562509 is about 394.8560261491.

The spelling of 61562509 in words is "sixty-one million, five hundred sixty-two thousand, five hundred nine".