69040921 has 4 divisors (see below), whose sum is σ = 69057792. Its totient is φ = 69024052.

The previous prime is 69040913. The next prime is 69040931. The reversal of 69040921 is 12904096.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 69040921 - 2³ = 69040913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69040901) 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, 2040 + ... + 11926.

It is an arithmetic number, because the mean of its divisors is an integer number (17264448).

Almost surely, 2^69040921 is an apocalyptic number.

It is an amenable number.

69040921 is a deficient number, since it is larger than the sum of its proper divisors (16871).

69040921 is an equidigital number, since it uses as much as digits as its factorization.

69040921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16870.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 69040921 is about 8309.0866525750. The cubic root of 69040921 is about 410.2376591590.

The spelling of 69040921 in words is "sixty-nine million, forty thousand, nine hundred twenty-one".