61731541 has 2 divisors, whose sum is σ = 61731542. Its totient is φ = 61731540.

The previous prime is 61731521. The next prime is 61731569. The reversal of 61731541 is 14513716.

It is an a-pointer prime, because the next prime (61731569) can be obtained adding 61731541 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61685316 + 46225 = 7854^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 61731541 - 2¹⁹ = 61207253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61731521) 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, 30865770 + 30865771.

It is an arithmetic number, because the mean of its divisors is an integer number (30865771).

Almost surely, 2^61731541 is an apocalyptic number.

It is an amenable number.

61731541 is a deficient number, since it is larger than the sum of its proper divisors (1).

61731541 is an equidigital number, since it uses as much as digits as its factorization.

61731541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 61731541 is about 7856.9422169187. The cubic root of 61731541 is about 395.2170809116.

The spelling of 61731541 in words is "sixty-one million, seven hundred thirty-one thousand, five hundred forty-one".