61121249989 has 4 divisors (see below), whose sum is σ = 61121969440. Its totient is φ = 61120530540.

The previous prime is 61121249977. The next prime is 61121250013. The reversal of 61121249989 is 98994212116.

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 61121249989 - 2⁹ = 61121249477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121249909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212097 + ... + 408934.

It is an arithmetic number, because the mean of its divisors is an integer number (15280492360).

Almost surely, 2^61121249989 is an apocalyptic number.

It is an amenable number.

61121249989 is a deficient number, since it is larger than the sum of its proper divisors (719451).

61121249989 is an equidigital number, since it uses as much as digits as its factorization.

61121249989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719450.

The product of its digits is 559872, while the sum is 52.

The spelling of 61121249989 in words is "sixty-one billion, one hundred twenty-one million, two hundred forty-nine thousand, nine hundred eighty-nine".