61415987 has 2 divisors, whose sum is σ = 61415988. Its totient is φ = 61415986.

The previous prime is 61415947. The next prime is 61415989. The reversal of 61415987 is 78951416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61415987 - 2¹⁰ = 61414963 is a prime.

Together with 61415989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61415989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30707993 + 30707994.

It is an arithmetic number, because the mean of its divisors is an integer number (30707994).

Almost surely, 2^61415987 is an apocalyptic number.

61415987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61415987 is an equidigital number, since it uses as much as digits as its factorization.

61415987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 61415987 is about 7836.8352668663. The cubic root of 61415987 is about 394.5425179454.

The spelling of 61415987 in words is "sixty-one million, four hundred fifteen thousand, nine hundred eighty-seven".