61573213 has 4 divisors (see below), whose sum is σ = 66309628. Its totient is φ = 56836800.

The previous prime is 61573189. The next prime is 61573219. The reversal of 61573213 is 31237516.

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 40615129 + 20958084 = 6373^2 + 4578^2 .

It is a cyclic number.

It is not a de Polignac number, because 61573213 - 2⁵ = 61573181 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 (61573219) 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, 2368188 + ... + 2368213.

It is an arithmetic number, because the mean of its divisors is an integer number (16577407).

Almost surely, 2^61573213 is an apocalyptic number.

It is an amenable number.

61573213 is a deficient number, since it is larger than the sum of its proper divisors (4736415).

61573213 is a wasteful number, since it uses less digits than its factorization.

61573213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736414.

The product of its digits is 3780, while the sum is 28.

The square root of 61573213 is about 7846.8600726660. The cubic root of 61573213 is about 394.8789096326.

The spelling of 61573213 in words is "sixty-one million, five hundred seventy-three thousand, two hundred thirteen".