61551113 has 4 divisors (see below), whose sum is σ = 66285828. Its totient is φ = 56816400.

The previous prime is 61551097. The next prime is 61551121. The reversal of 61551113 is 31115516.

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 6390784 + 55160329 = 2528^2 + 7427^2 .

It is a cyclic number.

It is not a de Polignac number, because 61551113 - 2⁴ = 61551097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61551173) 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, 2367338 + ... + 2367363.

It is an arithmetic number, because the mean of its divisors is an integer number (16571457).

Almost surely, 2^61551113 is an apocalyptic number.

It is an amenable number.

61551113 is a deficient number, since it is larger than the sum of its proper divisors (4734715).

61551113 is a wasteful number, since it uses less digits than its factorization.

61551113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734714.

The product of its digits is 450, while the sum is 23.

The square root of 61551113 is about 7845.4517397024. The cubic root of 61551113 is about 394.8316603620.

Adding to 61551113 its reverse (31115516), we get a palindrome (92666629).

The spelling of 61551113 in words is "sixty-one million, five hundred fifty-one thousand, one hundred thirteen".