61687311 has 16 divisors (see below), whose sum is σ = 98087424. Its totient is φ = 33717024.

The previous prime is 61687291. The next prime is 61687313. The reversal of 61687311 is 11378616.

It is not a de Polignac number, because 61687311 - 2⁵ = 61687279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61687313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63376 + ... + 64341.

It is an arithmetic number, because the mean of its divisors is an integer number (6130464).

Almost surely, 2^61687311 is an apocalyptic number.

61687311 is a deficient number, since it is larger than the sum of its proper divisors (36400113).

61687311 is a wasteful number, since it uses less digits than its factorization.

61687311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127750.

The product of its digits is 6048, while the sum is 33.

The square root of 61687311 is about 7854.1270043207. The cubic root of 61687311 is about 395.1226687320.

The spelling of 61687311 in words is "sixty-one million, six hundred eighty-seven thousand, three hundred eleven".