69979421 has 2 divisors, whose sum is σ = 69979422. Its totient is φ = 69979420.

The previous prime is 69979387. The next prime is 69979433. The reversal of 69979421 is 12497996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 1999396 = 8245^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 69979421 - 2¹⁴ = 69963037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69979621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34989710 + 34989711.

It is an arithmetic number, because the mean of its divisors is an integer number (34989711).

Almost surely, 2^69979421 is an apocalyptic number.

It is an amenable number.

69979421 is a deficient number, since it is larger than the sum of its proper divisors (1).

69979421 is an equidigital number, since it uses as much as digits as its factorization.

69979421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 69979421 is about 8365.3703444617. The cubic root of 69979421 is about 412.0881393891.

The spelling of 69979421 in words is "sixty-nine million, nine hundred seventy-nine thousand, four hundred twenty-one".