61281487 has 2 divisors, whose sum is σ = 61281488. Its totient is φ = 61281486.

The previous prime is 61281469. The next prime is 61281491. The reversal of 61281487 is 78418216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61281487 - 2¹⁹ = 60757199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61281427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640743 + 30640744.

It is an arithmetic number, because the mean of its divisors is an integer number (30640744).

Almost surely, 2^61281487 is an apocalyptic number.

61281487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281487 is an equidigital number, since it uses as much as digits as its factorization.

61281487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 61281487 is about 7828.2492934244. The cubic root of 61281487 is about 394.2542935686.

The spelling of 61281487 in words is "sixty-one million, two hundred eighty-one thousand, four hundred eighty-seven".