123698531 has 16 divisors (see below), whose sum is σ = 148227840. Its totient is φ = 101898720.

The previous prime is 123698507. The next prime is 123698537. The reversal of 123698531 is 135896321.

It is a happy number.

It is not a de Polignac number, because 123698531 - 2¹⁰ = 123697507 is a prime.

It is a super-2 number, since 2×123698531² = 30602653143115922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123698537) 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 15 ways as a sum of consecutive naturals, for example, 8060 + ... + 17673.

It is an arithmetic number, because the mean of its divisors is an integer number (9264240).

Almost surely, 2^123698531 is an apocalyptic number.

123698531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123698531 is a deficient number, since it is larger than the sum of its proper divisors (24529309).

123698531 is a wasteful number, since it uses less digits than its factorization.

123698531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25786.

The product of its digits is 38880, while the sum is 38.

The square root of 123698531 is about 11121.9841305407. The cubic root of 123698531 is about 498.2586504438.

The spelling of 123698531 in words is "one hundred twenty-three million, six hundred ninety-eight thousand, five hundred thirty-one".