61917487 has 2 divisors, whose sum is σ = 61917488. Its totient is φ = 61917486.

The previous prime is 61917469. The next prime is 61917517. The reversal of 61917487 is 78471916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61917487 - 2¹¹ = 61915439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61917437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30958743 + 30958744.

It is an arithmetic number, because the mean of its divisors is an integer number (30958744).

Almost surely, 2^61917487 is an apocalyptic number.

61917487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61917487 is an equidigital number, since it uses as much as digits as its factorization.

61917487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 43.

The square root of 61917487 is about 7868.7665488309. The cubic root of 61917487 is about 395.6135037135.

The spelling of 61917487 in words is "sixty-one million, nine hundred seventeen thousand, four hundred eighty-seven".