123412691 has 4 divisors (see below), whose sum is σ = 123460800. Its totient is φ = 123364584.

The previous prime is 123412637. The next prime is 123412693. The reversal of 123412691 is 196214321.

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 123412691 - 2¹⁴ = 123396307 is a prime.

It is a super-2 number, since 2×123412691² = 30461384599722962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123412693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19976 + ... + 25413.

It is an arithmetic number, because the mean of its divisors is an integer number (30865200).

Almost surely, 2^123412691 is an apocalyptic number.

123412691 is a deficient number, since it is larger than the sum of its proper divisors (48109).

123412691 is an equidigital number, since it uses as much as digits as its factorization.

123412691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48108.

The product of its digits is 2592, while the sum is 29.

The square root of 123412691 is about 11109.1264733101. The cubic root of 123412691 is about 497.8745658616.

The spelling of 123412691 in words is "one hundred twenty-three million, four hundred twelve thousand, six hundred ninety-one".