1606989431 has 8 divisors (see below), whose sum is σ = 1636122240. Its totient is φ = 1577919928.

The previous prime is 1606989343. The next prime is 1606989437. The reversal of 1606989431 is 1349896061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1606989431 - 2²² = 1602795127 is a prime.

It is a super-2 number, since 2×1606989431² = 5164830062691407522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606989437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36980 + ... + 67686.

It is an arithmetic number, because the mean of its divisors is an integer number (204515280).

Almost surely, 2^1606989431 is an apocalyptic number.

1606989431 is a deficient number, since it is larger than the sum of its proper divisors (29132809).

1606989431 is an equidigital number, since it uses as much as digits as its factorization.

1606989431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31653.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1606989431 is about 40087.2726809894. The cubic root of 1606989431 is about 1171.3077230316.

The spelling of 1606989431 in words is "one billion, six hundred six million, nine hundred eighty-nine thousand, four hundred thirty-one".