69172421 has 2 divisors, whose sum is σ = 69172422. Its totient is φ = 69172420.

The previous prime is 69172403. The next prime is 69172429. The reversal of 69172421 is 12427196.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 19624900 = 7039^2 + 4430^2 .

It is a cyclic number.

It is not a de Polignac number, because 69172421 - 2²⁶ = 2063557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69172429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34586210 + 34586211.

It is an arithmetic number, because the mean of its divisors is an integer number (34586211).

Almost surely, 2^69172421 is an apocalyptic number.

It is an amenable number.

69172421 is a deficient number, since it is larger than the sum of its proper divisors (1).

69172421 is an equidigital number, since it uses as much as digits as its factorization.

69172421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 69172421 is about 8316.9959119865. The cubic root of 69172421 is about 410.4979494221.

The spelling of 69172421 in words is "sixty-nine million, one hundred seventy-two thousand, four hundred twenty-one".