123172087 has 4 divisors (see below), whose sum is σ = 124323336. Its totient is φ = 122020840.

The previous prime is 123172069. The next prime is 123172103. The reversal of 123172087 is 780271321.

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

It is a cyclic number.

It is not a de Polignac number, because 123172087 - 2¹⁵ = 123139319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123172037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575464 + ... + 575677.

It is an arithmetic number, because the mean of its divisors is an integer number (31080834).

Almost surely, 2^123172087 is an apocalyptic number.

123172087 is a deficient number, since it is larger than the sum of its proper divisors (1151249).

123172087 is a wasteful number, since it uses less digits than its factorization.

123172087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151248.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 123172087 is about 11098.2920758106. The cubic root of 123172087 is about 497.5508051446.

The spelling of 123172087 in words is "one hundred twenty-three million, one hundred seventy-two thousand, eighty-seven".