61418509 has 2 divisors, whose sum is σ = 61418510. Its totient is φ = 61418508.

The previous prime is 61418453. The next prime is 61418537. The reversal of 61418509 is 90581416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38713284 + 22705225 = 6222^2 + 4765^2 .

It is a cyclic number.

It is not a de Polignac number, because 61418509 - 2⁷ = 61418381 is a 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 (61418209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30709254 + 30709255.

It is an arithmetic number, because the mean of its divisors is an integer number (30709255).

Almost surely, 2^61418509 is an apocalyptic number.

It is an amenable number.

61418509 is a deficient number, since it is larger than the sum of its proper divisors (1).

61418509 is an equidigital number, since it uses as much as digits as its factorization.

61418509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 61418509 is about 7836.9961720037. The cubic root of 61418509 is about 394.5479183993.

The spelling of 61418509 in words is "sixty-one million, four hundred eighteen thousand, five hundred nine".