309213041 has 4 divisors (see below), whose sum is σ = 314454000. Its totient is φ = 303972084.

The previous prime is 309213007. The next prime is 309213061. The reversal of 309213041 is 140312903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 140312903 = 23 ⋅6100561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309213041 is a prime.

It is a super-2 number, since 2×309213041² = 191225409448935362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309212998 and 309213016.

It is not an unprimeable number, because it can be changed into a prime (309213061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2620391 + ... + 2620508.

It is an arithmetic number, because the mean of its divisors is an integer number (78613500).

Almost surely, 2^309213041 is an apocalyptic number.

It is an amenable number.

309213041 is a deficient number, since it is larger than the sum of its proper divisors (5240959).

309213041 is an equidigital number, since it uses as much as digits as its factorization.

309213041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240958.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 309213041 is about 17584.4545266551. The cubic root of 309213041 is about 676.2167653587.

Adding to 309213041 its reverse (140312903), we get a palindrome (449525944).

The spelling of 309213041 in words is "three hundred nine million, two hundred thirteen thousand, forty-one".