61291880229 has 4 divisors (see below), whose sum is σ = 81722506976. Its totient is φ = 40861253484.

The previous prime is 61291880201. The next prime is 61291880231. The reversal of 61291880229 is 92208819216.

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 61291880229 - 2⁸ = 61291879973 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 (61291880129) 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, 10215313369 + ... + 10215313374.

It is an arithmetic number, because the mean of its divisors is an integer number (20430626744).

Almost surely, 2^61291880229 is an apocalyptic number.

It is an amenable number.

61291880229 is a deficient number, since it is larger than the sum of its proper divisors (20430626747).

61291880229 is a wasteful number, since it uses less digits than its factorization.

61291880229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430626746.

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 61291880229 in words is "sixty-one billion, two hundred ninety-one million, eight hundred eighty thousand, two hundred twenty-nine".