164526421 has 2 divisors, whose sum is σ = 164526422. Its totient is φ = 164526420.

The previous prime is 164526419. The next prime is 164526431. The reversal of 164526421 is 124625461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164480625 + 45796 = 12825^2 + 214^2 .

It is an emirp because it is prime and its reverse (124625461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164526421 - 2¹ = 164526419 is a prime.

Together with 164526419, it forms a pair of twin primes.

It is equal to p_9213934 and since 164526421 and 9213934 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164526431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82263210 + 82263211.

It is an arithmetic number, because the mean of its divisors is an integer number (82263211).

Almost surely, 2^164526421 is an apocalyptic number.

It is an amenable number.

164526421 is a deficient number, since it is larger than the sum of its proper divisors (1).

164526421 is an equidigital number, since it uses as much as digits as its factorization.

164526421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 164526421 is about 12826.7852948430. The cubic root of 164526421 is about 547.9554071107.

The spelling of 164526421 in words is "one hundred sixty-four million, five hundred twenty-six thousand, four hundred twenty-one".