61551213 has 16 divisors (see below), whose sum is σ = 85479936. Its totient is φ = 39352320.

The previous prime is 61551187. The next prime is 61551221. The reversal of 61551213 is 31215516.

It is not a de Polignac number, because 61551213 - 2⁵ = 61551181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7581 + ... + 13437.

It is an arithmetic number, because the mean of its divisors is an integer number (5342496).

Almost surely, 2^61551213 is an apocalyptic number.

It is an amenable number.

61551213 is a deficient number, since it is larger than the sum of its proper divisors (23928723).

61551213 is a wasteful number, since it uses less digits than its factorization.

61551213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6004.

The product of its digits is 900, while the sum is 24.

The square root of 61551213 is about 7845.4581128192. The cubic root of 61551213 is about 394.8318741851.

Adding to 61551213 its reverse (31215516), we get a palindrome (92766729).

The spelling of 61551213 in words is "sixty-one million, five hundred fifty-one thousand, two hundred thirteen".