16431613 has 4 divisors (see below), whose sum is σ = 17925408. Its totient is φ = 14937820.

The previous prime is 16431587. The next prime is 16431617. The reversal of 16431613 is 31613461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16431613 - 2⁹ = 16431101 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 (16431617) 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, 746881 + ... + 746902.

It is an arithmetic number, because the mean of its divisors is an integer number (4481352).

Almost surely, 2^16431613 is an apocalyptic number.

It is an amenable number.

16431613 is a deficient number, since it is larger than the sum of its proper divisors (1493795).

16431613 is a wasteful number, since it uses less digits than its factorization.

16431613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493794.

The product of its digits is 1296, while the sum is 25.

The square root of 16431613 is about 4053.5926040982. The cubic root of 16431613 is about 254.2299620319.

The spelling of 16431613 in words is "sixteen million, four hundred thirty-one thousand, six hundred thirteen".