1313720146 has 12 divisors (see below), whose sum is σ = 1988843886. Its totient is φ = 650777120.

The previous prime is 1313720123. The next prime is 1313720147. The reversal of 1313720146 is 6410273131.

It can be written as a sum of positive squares in only one way, i.e., 1307907225 + 5812921 = 36165^2 + 2411^2 .

It is a super-2 number, since 2×1313720146² = 3451721244012522632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313720147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 543681 + ... + 546091.

Almost surely, 2^1313720146 is an apocalyptic number.

1313720146 is a deficient number, since it is larger than the sum of its proper divisors (675123740).

1313720146 is an frugal number, since it uses more digits than its factorization.

1313720146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1313720146 is about 36245.2775682571. The cubic root of 1313720146 is about 1095.2189594312.

Adding to 1313720146 its reverse (6410273131), we get a palindrome (7723993277).

The spelling of 1313720146 in words is "one billion, three hundred thirteen million, seven hundred twenty thousand, one hundred forty-six".