61091229 has 4 divisors (see below), whose sum is σ = 81454976. Its totient is φ = 40727484.

The previous prime is 61091201. The next prime is 61091249. The reversal of 61091229 is 92219016.

It is a happy number.

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 61091229 - 2⁷ = 61091101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61091196 and 61091205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61091249) 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, 10181869 + ... + 10181874.

It is an arithmetic number, because the mean of its divisors is an integer number (20363744).

Almost surely, 2^61091229 is an apocalyptic number.

It is an amenable number.

61091229 is a deficient number, since it is larger than the sum of its proper divisors (20363747).

61091229 is a wasteful number, since it uses less digits than its factorization.

61091229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20363746.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 61091229 is about 7816.0878321575. The cubic root of 61091229 is about 393.8458624745.

The spelling of 61091229 in words is "sixty-one million, ninety-one thousand, two hundred twenty-nine".