61516387 has 8 divisors (see below), whose sum is σ = 65650176. Its totient is φ = 57439872.

The previous prime is 61516381. The next prime is 61516391. The reversal of 61516387 is 78361516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61516387 - 2¹¹ = 61514339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61516381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12088 + ... + 16405.

It is an arithmetic number, because the mean of its divisors is an integer number (8206272).

Almost surely, 2^61516387 is an apocalyptic number.

61516387 is a deficient number, since it is larger than the sum of its proper divisors (4133789).

61516387 is a wasteful number, since it uses less digits than its factorization.

61516387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28637.

The product of its digits is 30240, while the sum is 37.

The square root of 61516387 is about 7843.2382980501. The cubic root of 61516387 is about 394.7573941527.

The spelling of 61516387 in words is "sixty-one million, five hundred sixteen thousand, three hundred eighty-seven".