61211413 has 4 divisors (see below), whose sum is σ = 61251340. Its totient is φ = 61171488.

The previous prime is 61211389. The next prime is 61211419. The reversal of 61211413 is 31411216.

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 20277009 + 40934404 = 4503^2 + 6398^2 .

It is not a de Polignac number, because 61211413 - 2¹³ = 61203221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61211419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17568 + ... + 20761.

It is an arithmetic number, because the mean of its divisors is an integer number (15312835).

Almost surely, 2^61211413 is an apocalyptic number.

It is an amenable number.

61211413 is a deficient number, since it is larger than the sum of its proper divisors (39927).

61211413 is a wasteful number, since it uses less digits than its factorization.

61211413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39926.

The product of its digits is 144, while the sum is 19.

The square root of 61211413 is about 7823.7722998564. The cubic root of 61211413 is about 394.1039626194.

Adding to 61211413 its reverse (31411216), we get a palindrome (92622629).

The spelling of 61211413 in words is "sixty-one million, two hundred eleven thousand, four hundred thirteen".