61771487 has 2 divisors, whose sum is σ = 61771488. Its totient is φ = 61771486.

The previous prime is 61771483. The next prime is 61771513. The reversal of 61771487 is 78417716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61771487 - 2² = 61771483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885743 + 30885744.

It is an arithmetic number, because the mean of its divisors is an integer number (30885744).

Almost surely, 2^61771487 is an apocalyptic number.

61771487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771487 is an equidigital number, since it uses as much as digits as its factorization.

61771487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 41.

The square root of 61771487 is about 7859.4838889077. The cubic root of 61771487 is about 395.3023098302.

The spelling of 61771487 in words is "sixty-one million, seven hundred seventy-one thousand, four hundred eighty-seven".