61731587 has 2 divisors, whose sum is σ = 61731588. Its totient is φ = 61731586.

The previous prime is 61731569. The next prime is 61731611. The reversal of 61731587 is 78513716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61731587 - 2⁸ = 61731331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61731587.

It is not a weakly prime, because it can be changed into another prime (61751587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30865793 + 30865794.

It is an arithmetic number, because the mean of its divisors is an integer number (30865794).

Almost surely, 2^61731587 is an apocalyptic number.

61731587 is a deficient number, since it is larger than the sum of its proper divisors (1).

61731587 is an equidigital number, since it uses as much as digits as its factorization.

61731587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 61731587 is about 7856.9451442657. The cubic root of 61731587 is about 395.2171790785.

The spelling of 61731587 in words is "sixty-one million, seven hundred thirty-one thousand, five hundred eighty-seven".