61228929 has 4 divisors (see below), whose sum is σ = 81638576. Its totient is φ = 40819284.

The previous prime is 61228907. The next prime is 61228943. The reversal of 61228929 is 92982216.

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 61228929 - 2¹² = 61224833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61228429) 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, 10204819 + ... + 10204824.

It is an arithmetic number, because the mean of its divisors is an integer number (20409644).

Almost surely, 2^61228929 is an apocalyptic number.

It is an amenable number.

61228929 is a deficient number, since it is larger than the sum of its proper divisors (20409647).

61228929 is a wasteful number, since it uses less digits than its factorization.

61228929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20409646.

The product of its digits is 31104, while the sum is 39.

The square root of 61228929 is about 7824.8916286425. The cubic root of 61228929 is about 394.1415507440.

It can be divided in two parts, 6122 and 8929, that added together give a palindrome (15051).

The spelling of 61228929 in words is "sixty-one million, two hundred twenty-eight thousand, nine hundred twenty-nine".