61217151241 has 3 divisors (see below), whose sum is σ = 61217398663. Its totient is φ = 61216903820.

The previous prime is 61217151239. The next prime is 61217151293. The reversal of 61217151241 is 14215171216.

It is a happy number.

The square root of 61217151241 is 247421.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3049358841 + 58167792400 = 55221^2 + 241180^2 .

It is not a de Polignac number, because 61217151241 - 2¹ = 61217151239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61217181241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 123711 + ... + 371131.

Almost surely, 2^61217151241 is an apocalyptic number.

61217151241 is the 247421-st square number.

61217151241 is the 123711-st centered octagonal number.

It is an amenable number.

61217151241 is a deficient number, since it is larger than the sum of its proper divisors (247422).

61217151241 is an frugal number, since it uses more digits than its factorization.

61217151241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494842 (or 247421 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The spelling of 61217151241 in words is "sixty-one billion, two hundred seventeen million, one hundred fifty-one thousand, two hundred forty-one".