1616427989 has 12 divisors (see below), whose sum is σ = 1778250432. Its totient is φ = 1468226760.

The previous prime is 1616427941. The next prime is 1616428001. The reversal of 1616427989 is 9897246161.

It is a de Polignac number, because none of the positive numbers 2^k-1616427989 is a prime.

It is a super-2 number, since 2×1616427989² = 5225678887245168242, 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 1616427989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616427929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155534 + ... + 165600.

It is an arithmetic number, because the mean of its divisors is an integer number (148187536).

Almost surely, 2^1616427989 is an apocalyptic number.

It is an amenable number.

1616427989 is a deficient number, since it is larger than the sum of its proper divisors (161822443).

1616427989 is a wasteful number, since it uses less digits than its factorization.

1616427989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416 (or 11405 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 53.

The square root of 1616427989 is about 40204.8254442175. The cubic root of 1616427989 is about 1173.5964503239.

The spelling of 1616427989 in words is "one billion, six hundred sixteen million, four hundred twenty-seven thousand, nine hundred eighty-nine".