313109521 has 2 divisors, whose sum is σ = 313109522. Its totient is φ = 313109520.

The previous prime is 313109453. The next prime is 313109539. The reversal of 313109521 is 125901313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278723025 + 34386496 = 16695^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 313109521 - 2¹³ = 313101329 is a prime.

It is not a weakly prime, because it can be changed into another prime (313109561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156554760 + 156554761.

It is an arithmetic number, because the mean of its divisors is an integer number (156554761).

Almost surely, 2^313109521 is an apocalyptic number.

It is an amenable number.

313109521 is a deficient number, since it is larger than the sum of its proper divisors (1).

313109521 is an equidigital number, since it uses as much as digits as its factorization.

313109521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 313109521 is about 17694.9009887029. The cubic root of 313109521 is about 679.0453161554.

The spelling of 313109521 in words is "three hundred thirteen million, one hundred nine thousand, five hundred twenty-one".