153421997 has 2 divisors, whose sum is σ = 153421998. Its totient is φ = 153421996.

The previous prime is 153421981. The next prime is 153422047. The reversal of 153421997 is 799124351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137851081 + 15570916 = 11741^2 + 3946^2 .

It is a cyclic number.

It is not a de Polignac number, because 153421997 - 2⁴ = 153421981 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 (153421907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76710998 + 76710999.

It is an arithmetic number, because the mean of its divisors is an integer number (76710999).

Almost surely, 2^153421997 is an apocalyptic number.

It is an amenable number.

153421997 is a deficient number, since it is larger than the sum of its proper divisors (1).

153421997 is an equidigital number, since it uses as much as digits as its factorization.

153421997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 153421997 is about 12386.3633484570. The cubic root of 153421997 is about 535.3394032360.

The spelling of 153421997 in words is "one hundred fifty-three million, four hundred twenty-one thousand, nine hundred ninety-seven".