197421451 has 2 divisors, whose sum is σ = 197421452. Its totient is φ = 197421450.

The previous prime is 197421431. The next prime is 197421461. The reversal of 197421451 is 154124791.

197421451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (154124791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197421451 is a prime.

It is a super-4 number, since 4×197421451⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (197421401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98710725 + 98710726.

It is an arithmetic number, because the mean of its divisors is an integer number (98710726).

Almost surely, 2^197421451 is an apocalyptic number.

197421451 is a deficient number, since it is larger than the sum of its proper divisors (1).

197421451 is an equidigital number, since it uses as much as digits as its factorization.

197421451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 197421451 is about 14050.6743966259. The cubic root of 197421451 is about 582.2794277452.

The spelling of 197421451 in words is "one hundred ninety-seven million, four hundred twenty-one thousand, four hundred fifty-one".