61704157 has 2 divisors, whose sum is σ = 61704158. Its totient is φ = 61704156.

The previous prime is 61704133. The next prime is 61704161. The reversal of 61704157 is 75140716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 3426201 = 7634^2 + 1851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61704157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61704127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30852078 + 30852079.

It is an arithmetic number, because the mean of its divisors is an integer number (30852079).

Almost surely, 2^61704157 is an apocalyptic number.

It is an amenable number.

61704157 is a deficient number, since it is larger than the sum of its proper divisors (1).

61704157 is an equidigital number, since it uses as much as digits as its factorization.

61704157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 61704157 is about 7855.1993609329. The cubic root of 61704157 is about 395.1586330740.

The spelling of 61704157 in words is "sixty-one million, seven hundred four thousand, one hundred fifty-seven".