61009213 has 4 divisors (see below), whose sum is σ = 61039900. Its totient is φ = 60978528.

The previous prime is 61009199. The next prime is 61009231. The reversal of 61009213 is 31290016.

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 6441444 + 54567769 = 2538^2 + 7387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61009213 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 (61009253) 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, 12138 + ... + 16411.

It is an arithmetic number, because the mean of its divisors is an integer number (15259975).

Almost surely, 2^61009213 is an apocalyptic number.

It is an amenable number.

61009213 is a deficient number, since it is larger than the sum of its proper divisors (30687).

61009213 is a wasteful number, since it uses less digits than its factorization.

61009213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30686.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 61009213 is about 7810.8394555259. The cubic root of 61009213 is about 393.6695353172.

Adding to 61009213 its reverse (31290016), we get a palindrome (92299229).

The spelling of 61009213 in words is "sixty-one million, nine thousand, two hundred thirteen".