69457921 has 4 divisors (see below), whose sum is σ = 74800852. Its totient is φ = 64114992.

The previous prime is 69457897. The next prime is 69457957. The reversal of 69457921 is 12975496.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43560000 + 25897921 = 6600^2 + 5089^2 .

It is a cyclic number.

It is not a de Polignac number, because 69457921 - 2⁵ = 69457889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69457981) 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, 2671446 + ... + 2671471.

It is an arithmetic number, because the mean of its divisors is an integer number (18700213).

Almost surely, 2^69457921 is an apocalyptic number.

It is an amenable number.

69457921 is a deficient number, since it is larger than the sum of its proper divisors (5342931).

69457921 is a wasteful number, since it uses less digits than its factorization.

69457921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5342930.

The product of its digits is 136080, while the sum is 43.

The square root of 69457921 is about 8334.1418874411. The cubic root of 69457921 is about 411.0619328372.

The spelling of 69457921 in words is "sixty-nine million, four hundred fifty-seven thousand, nine hundred twenty-one".