61506689 has 2 divisors, whose sum is σ = 61506690. Its totient is φ = 61506688.

The previous prime is 61506673. The next prime is 61506701. The reversal of 61506689 is 98660516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32433025 + 29073664 = 5695^2 + 5392^2 .

It is a cyclic number.

It is not a de Polignac number, because 61506689 - 2⁴ = 61506673 is a prime.

It is not a weakly prime, because it can be changed into another prime (61506619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30753344 + 30753345.

It is an arithmetic number, because the mean of its divisors is an integer number (30753345).

Almost surely, 2^61506689 is an apocalyptic number.

It is an amenable number.

61506689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61506689 is an equidigital number, since it uses as much as digits as its factorization.

61506689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 61506689 is about 7842.6200341468. The cubic root of 61506689 is about 394.7366486864.

The spelling of 61506689 in words is "sixty-one million, five hundred six thousand, six hundred eighty-nine".