69913721 has 4 divisors (see below), whose sum is σ = 72953472. Its totient is φ = 66873972.

The previous prime is 69913717. The next prime is 69913759. The reversal of 69913721 is 12731996.

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 69913721 - 2² = 69913717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69913121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519841 + ... + 1519886.

It is an arithmetic number, because the mean of its divisors is an integer number (18238368).

Almost surely, 2^69913721 is an apocalyptic number.

It is an amenable number.

69913721 is a deficient number, since it is larger than the sum of its proper divisors (3039751).

69913721 is a wasteful number, since it uses less digits than its factorization.

69913721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039750.

The product of its digits is 20412, while the sum is 38.

The square root of 69913721 is about 8361.4425190872. The cubic root of 69913721 is about 411.9591363782.

The spelling of 69913721 in words is "sixty-nine million, nine hundred thirteen thousand, seven hundred twenty-one".