209463105154 has 4 divisors (see below), whose sum is σ = 314194657734. Its totient is φ = 104731552576.

The previous prime is 209463105149. The next prime is 209463105157. The reversal of 209463105154 is 451501364902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 163826610025 + 45636495129 = 404755^2 + 213627^2 .

It is a super-2 number, since 2×209463105154² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209463105157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52365776287 + ... + 52365776290.

Almost surely, 2^209463105154 is an apocalyptic number.

209463105154 is a deficient number, since it is larger than the sum of its proper divisors (104731552580).

209463105154 is a wasteful number, since it uses less digits than its factorization.

209463105154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104731552579.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 209463105154 in words is "two hundred nine billion, four hundred sixty-three million, one hundred five thousand, one hundred fifty-four".