313220145 has 16 divisors (see below), whose sum is σ = 572745600. Its totient is φ = 143186304.

The previous prime is 313220129. The next prime is 313220147. The reversal of 313220145 is 541022313.

It is not a de Polignac number, because 313220145 - 2⁴ = 313220129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (313220147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1491420 + ... + 1491629.

It is an arithmetic number, because the mean of its divisors is an integer number (35796600).

Almost surely, 2^313220145 is an apocalyptic number.

313220145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

313220145 is a deficient number, since it is larger than the sum of its proper divisors (259525455).

313220145 is a wasteful number, since it uses less digits than its factorization.

313220145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983064.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 313220145 is about 17698.0265849049. The cubic root of 313220145 is about 679.1252773821.

Adding to 313220145 its reverse (541022313), we get a palindrome (854242458).

The spelling of 313220145 in words is "three hundred thirteen million, two hundred twenty thousand, one hundred forty-five".