61455117 has 4 divisors (see below), whose sum is σ = 81940160. Its totient is φ = 40970076.

The previous prime is 61455083. The next prime is 61455137. The reversal of 61455117 is 71155416.

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 not a de Polignac number, because 61455117 - 2¹⁰ = 61454093 is a prime.

It is a Duffinian number.

It is a zygodrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61455137) 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, 10242517 + ... + 10242522.

It is an arithmetic number, because the mean of its divisors is an integer number (20485040).

Almost surely, 2^61455117 is an apocalyptic number.

It is an amenable number.

61455117 is a deficient number, since it is larger than the sum of its proper divisors (20485043).

61455117 is a wasteful number, since it uses less digits than its factorization.

61455117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20485042.

The product of its digits is 4200, while the sum is 30.

The square root of 61455117 is about 7839.3314128183. The cubic root of 61455117 is about 394.6262918501.

The spelling of 61455117 in words is "sixty-one million, four hundred fifty-five thousand, one hundred seventeen".