163997451 has 12 divisors (see below), whose sum is σ = 237437928. Its totient is φ = 109076544.

The previous prime is 163997401. The next prime is 163997461. The reversal of 163997451 is 154799361.

163997451 is a `hidden beast` number, since 1 + 639 + 9 + 7 + 4 + 5 + 1 = 666.

163997451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163997451 - 2¹⁵ = 163964683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163997397 and 163997406.

It is not an unprimeable number, because it can be changed into a prime (163997401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17145 + ... + 24938.

It is an arithmetic number, because the mean of its divisors is an integer number (19786494).

Almost surely, 2^163997451 is an apocalyptic number.

163997451 is a deficient number, since it is larger than the sum of its proper divisors (73440477).

163997451 is a wasteful number, since it uses less digits than its factorization.

163997451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42522 (or 42519 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 163997451 is about 12806.1489527492. The cubic root of 163997451 is about 547.3675315971.

The spelling of 163997451 in words is "one hundred sixty-three million, nine hundred ninety-seven thousand, four hundred fifty-one".