61391753 has 4 divisors (see below), whose sum is σ = 63508740. Its totient is φ = 59274768.

The previous prime is 61391747. The next prime is 61391789. The reversal of 61391753 is 35719316.

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 33965584 + 27426169 = 5828^2 + 5237^2 .

It is a cyclic number.

It is not a de Polignac number, because 61391753 - 2⁶ = 61391689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61391723) 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, 1058450 + ... + 1058507.

It is an arithmetic number, because the mean of its divisors is an integer number (15877185).

Almost surely, 2^61391753 is an apocalyptic number.

It is an amenable number.

61391753 is a deficient number, since it is larger than the sum of its proper divisors (2116987).

61391753 is a wasteful number, since it uses less digits than its factorization.

61391753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116986.

The product of its digits is 17010, while the sum is 35.

The square root of 61391753 is about 7835.2889544675. The cubic root of 61391753 is about 394.4906172286.

The spelling of 61391753 in words is "sixty-one million, three hundred ninety-one thousand, seven hundred fifty-three".