1645313090 has 8 divisors (see below), whose sum is σ = 2961563580. Its totient is φ = 658125232.

The previous prime is 1645313083. The next prime is 1645313101. The reversal of 1645313090 is 903135461.

It can be written as a sum of positive squares in 2 ways, for example, as 1619982001 + 25331089 = 40249^2 + 5033^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82265645 + ... + 82265664.

Almost surely, 2^1645313090 is an apocalyptic number.

1645313090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645313090 is a deficient number, since it is larger than the sum of its proper divisors (1316250490).

1645313090 is a wasteful number, since it uses less digits than its factorization.

1645313090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164531316.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1645313090 is about 40562.4591217051. The cubic root of 1645313090 is about 1180.5458285860.

The spelling of 1645313090 in words is "one billion, six hundred forty-five million, three hundred thirteen thousand, ninety".