61021487 has 2 divisors, whose sum is σ = 61021488. Its totient is φ = 61021486.

The previous prime is 61021453. The next prime is 61021501. The reversal of 61021487 is 78412016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61021487 - 2¹² = 61017391 is a prime.

It is equal to p_3619235 and since 61021487 and 3619235 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61071487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510743 + 30510744.

It is an arithmetic number, because the mean of its divisors is an integer number (30510744).

Almost surely, 2^61021487 is an apocalyptic number.

61021487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61021487 is an equidigital number, since it uses as much as digits as its factorization.

61021487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61021487 is about 7811.6251190133. The cubic root of 61021487 is about 393.6959333843.

The spelling of 61021487 in words is "sixty-one million, twenty-one thousand, four hundred eighty-seven".