61905817 has 2 divisors, whose sum is σ = 61905818. Its totient is φ = 61905816.

The previous prime is 61905803. The next prime is 61905821. The reversal of 61905817 is 71850916.

61905817 is nontrivially palindromic in base 6.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57699216 + 4206601 = 7596^2 + 2051^2 .

It is a cyclic number.

It is not a de Polignac number, because 61905817 - 2⁷ = 61905689 is a prime.

It is equal to p_3668338 and since 61905817 and 3668338 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 (61905317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30952908 + 30952909.

It is an arithmetic number, because the mean of its divisors is an integer number (30952909).

Almost surely, 2^61905817 is an apocalyptic number.

It is an amenable number.

61905817 is a deficient number, since it is larger than the sum of its proper divisors (1).

61905817 is an equidigital number, since it uses as much as digits as its factorization.

61905817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 61905817 is about 7868.0249745409. The cubic root of 61905817 is about 395.5886475170.

The spelling of 61905817 in words is "sixty-one million, nine hundred five thousand, eight hundred seventeen".