108621431 has 4 divisors (see below), whose sum is σ = 109676112. Its totient is φ = 107566752.

The previous prime is 108621421. The next prime is 108621451. The reversal of 108621431 is 134126801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134126801 = 31 ⋅4326671.

It is a cyclic number.

It is not a de Polignac number, because 108621431 - 2¹⁸ = 108359287 is a prime.

It is a super-2 number, since 2×108621431² = 23597230544975522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108621431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108621421) 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, 527186 + ... + 527391.

It is an arithmetic number, because the mean of its divisors is an integer number (27419028).

Almost surely, 2^108621431 is an apocalyptic number.

108621431 is a deficient number, since it is larger than the sum of its proper divisors (1054681).

108621431 is a wasteful number, since it uses less digits than its factorization.

108621431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054680.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 108621431 is about 10422.1605725492. The cubic root of 108621431 is about 477.1319583872.

The spelling of 108621431 in words is "one hundred eight million, six hundred twenty-one thousand, four hundred thirty-one".