61388929 has 4 divisors (see below), whose sum is σ = 70158784. Its totient is φ = 52619076.

The previous prime is 61388903. The next prime is 61388941. The reversal of 61388929 is 92988316.

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 a de Polignac number, because none of the positive numbers 2^k-61388929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61388429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4384917 + ... + 4384930.

It is an arithmetic number, because the mean of its divisors is an integer number (17539696).

Almost surely, 2^61388929 is an apocalyptic number.

It is an amenable number.

61388929 is a deficient number, since it is larger than the sum of its proper divisors (8769855).

61388929 is an equidigital number, since it uses as much as digits as its factorization.

61388929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8769854.

The product of its digits is 186624, while the sum is 46.

The square root of 61388929 is about 7835.1087420661. The cubic root of 61388929 is about 394.4845683239.

The spelling of 61388929 in words is "sixty-one million, three hundred eighty-eight thousand, nine hundred twenty-nine".