61861049 has 2 divisors, whose sum is σ = 61861050. Its totient is φ = 61861048.

The previous prime is 61861043. The next prime is 61861057. The reversal of 61861049 is 94016816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60171049 + 1690000 = 7757^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 61861049 - 2⁸ = 61860793 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3665861 and since 61861049 and 3665861 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61861043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30930524 + 30930525.

It is an arithmetic number, because the mean of its divisors is an integer number (30930525).

Almost surely, 2^61861049 is an apocalyptic number.

It is an amenable number.

61861049 is a deficient number, since it is larger than the sum of its proper divisors (1).

61861049 is an equidigital number, since it uses as much as digits as its factorization.

61861049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 61861049 is about 7865.1795275124. The cubic root of 61861049 is about 395.4932661558.

The spelling of 61861049 in words is "sixty-one million, eight hundred sixty-one thousand, forty-nine".