61101991289 has 4 divisors (see below), whose sum is σ = 62137618320. Its totient is φ = 60066364260.

The previous prime is 61101991241. The next prime is 61101991309. The reversal of 61101991289 is 98219910116.

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 61101991289 - 2²⁸ = 60833555833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61101991189) 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, 517813427 + ... + 517813544.

It is an arithmetic number, because the mean of its divisors is an integer number (15534404580).

Almost surely, 2^61101991289 is an apocalyptic number.

It is an amenable number.

61101991289 is a deficient number, since it is larger than the sum of its proper divisors (1035627031).

61101991289 is a wasteful number, since it uses less digits than its factorization.

61101991289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035627030.

The product of its (nonzero) digits is 69984, while the sum is 47.

The spelling of 61101991289 in words is "sixty-one billion, one hundred one million, nine hundred ninety-one thousand, two hundred eighty-nine".