61906573 has 2 divisors, whose sum is σ = 61906574. Its totient is φ = 61906572.

The previous prime is 61906543. The next prime is 61906583. The reversal of 61906573 is 37560916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43270084 + 18636489 = 6578^2 + 4317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61906573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61906543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30953286 + 30953287.

It is an arithmetic number, because the mean of its divisors is an integer number (30953287).

Almost surely, 2^61906573 is an apocalyptic number.

It is an amenable number.

61906573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61906573 is an equidigital number, since it uses as much as digits as its factorization.

61906573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 61906573 is about 7868.0730169464. The cubic root of 61906573 is about 395.5902578331.

The spelling of 61906573 in words is "sixty-one million, nine hundred six thousand, five hundred seventy-three".