61189013 has 4 divisors (see below), whose sum is σ = 61876620. Its totient is φ = 60501408.

The previous prime is 61188997. The next prime is 61189021. The reversal of 61189013 is 31098116.

It is a happy number.

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 11303044 + 49885969 = 3362^2 + 7063^2 .

It is a cyclic number.

It is not a de Polignac number, because 61189013 - 2⁴ = 61188997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61189033) 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, 343670 + ... + 343847.

It is an arithmetic number, because the mean of its divisors is an integer number (15469155).

Almost surely, 2^61189013 is an apocalyptic number.

It is an amenable number.

61189013 is a deficient number, since it is larger than the sum of its proper divisors (687607).

61189013 is an equidigital number, since it uses as much as digits as its factorization.

61189013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687606.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 61189013 is about 7822.3406343626. The cubic root of 61189013 is about 394.0558833185.

The spelling of 61189013 in words is "sixty-one million, one hundred eighty-nine thousand, thirteen".