61582009 has 2 divisors, whose sum is σ = 61582010. Its totient is φ = 61582008.

The previous prime is 61581967. The next prime is 61582019. The reversal of 61582009 is 90028516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 21132409 = 6360^2 + 4597^2 .

It is a cyclic number.

It is not a de Polignac number, because 61582009 - 2⁷ = 61581881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61582019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30791004 + 30791005.

It is an arithmetic number, because the mean of its divisors is an integer number (30791005).

Almost surely, 2^61582009 is an apocalyptic number.

It is an amenable number.

61582009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61582009 is an equidigital number, since it uses as much as digits as its factorization.

61582009 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 31.

The square root of 61582009 is about 7847.4205316142. The cubic root of 61582009 is about 394.8977121244.

The spelling of 61582009 in words is "sixty-one million, five hundred eighty-two thousand, nine".