61561117 has 4 divisors (see below), whose sum is σ = 62870976. Its totient is φ = 60251260.

The previous prime is 61561103. The next prime is 61561127. The reversal of 61561117 is 71116516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61561117 - 2¹⁵ = 61528349 is a prime.

It is a super-2 number, since 2×61561117² = 7579542252575378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561127) 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, 654859 + ... + 654952.

It is an arithmetic number, because the mean of its divisors is an integer number (15717744).

Almost surely, 2^61561117 is an apocalyptic number.

It is an amenable number.

61561117 is a deficient number, since it is larger than the sum of its proper divisors (1309859).

61561117 is a wasteful number, since it uses less digits than its factorization.

61561117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309858.

The product of its digits is 1260, while the sum is 28.

The square root of 61561117 is about 7846.0892806544. The cubic root of 61561117 is about 394.8530500752.

The spelling of 61561117 in words is "sixty-one million, five hundred sixty-one thousand, one hundred seventeen".