61687193 has 4 divisors (see below), whose sum is σ = 61798500. Its totient is φ = 61575888.

The previous prime is 61687183. The next prime is 61687207. The reversal of 61687193 is 39178616.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32126224 + 29560969 = 5668^2 + 5437^2 .

It is a cyclic number.

It is not a de Polignac number, because 61687193 - 2¹⁴ = 61670809 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 61687193.

It is not an unprimeable number, because it can be changed into a prime (61687123) 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, 54818 + ... + 55931.

It is an arithmetic number, because the mean of its divisors is an integer number (15449625).

Almost surely, 2^61687193 is an apocalyptic number.

It is an amenable number.

61687193 is a deficient number, since it is larger than the sum of its proper divisors (111307).

61687193 is a wasteful number, since it uses less digits than its factorization.

61687193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111306.

The product of its digits is 54432, while the sum is 41.

The square root of 61687193 is about 7854.1194923429. The cubic root of 61687193 is about 395.1224167920.

The spelling of 61687193 in words is "sixty-one million, six hundred eighty-seven thousand, one hundred ninety-three".