61470509 has 2 divisors, whose sum is σ = 61470510. Its totient is φ = 61470508.

The previous prime is 61470481. The next prime is 61470511. The reversal of 61470509 is 90507416.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 11202409 = 7090^2 + 3347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61470509 is a prime.

Together with 61470511, it forms a pair of twin primes.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61470809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30735254 + 30735255.

It is an arithmetic number, because the mean of its divisors is an integer number (30735255).

Almost surely, 2^61470509 is an apocalyptic number.

It is an amenable number.

61470509 is a deficient number, since it is larger than the sum of its proper divisors (1).

61470509 is an equidigital number, since it uses as much as digits as its factorization.

61470509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 61470509 is about 7840.3130677289. The cubic root of 61470509 is about 394.6592350296.

The spelling of 61470509 in words is "sixty-one million, four hundred seventy thousand, five hundred nine".