61315687 has 4 divisors (see below), whose sum is σ = 61331800. Its totient is φ = 61299576.

The previous prime is 61315673. The next prime is 61315711. The reversal of 61315687 is 78651316.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61315687 - 2⁷ = 61315559 is a prime.

It is a super-2 number, since 2×61315687² = 7519226944563938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61315627) 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, 1189 + ... + 11137.

It is an arithmetic number, because the mean of its divisors is an integer number (15332950).

Almost surely, 2^61315687 is an apocalyptic number.

61315687 is a deficient number, since it is larger than the sum of its proper divisors (16113).

61315687 is an equidigital number, since it uses as much as digits as its factorization.

61315687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16112.

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

The square root of 61315687 is about 7830.4333851965. The cubic root of 61315687 is about 394.3276218008.

The spelling of 61315687 in words is "sixty-one million, three hundred fifteen thousand, six hundred eighty-seven".