61145687 has 4 divisors (see below), whose sum is σ = 61162776. Its totient is φ = 61128600.

The previous prime is 61145677. The next prime is 61145723. The reversal of 61145687 is 78654116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61145687 - 2²² = 56951383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61145687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61145677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893 + ... + 11094.

It is an arithmetic number, because the mean of its divisors is an integer number (15290694).

Almost surely, 2^61145687 is an apocalyptic number.

61145687 is a deficient number, since it is larger than the sum of its proper divisors (17089).

61145687 is a wasteful number, since it uses less digits than its factorization.

61145687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17088.

The product of its digits is 40320, while the sum is 38.

The square root of 61145687 is about 7819.5707682711. The cubic root of 61145687 is about 393.9628551994.

The spelling of 61145687 in words is "sixty-one million, one hundred forty-five thousand, six hundred eighty-seven".