312503161 has 4 divisors (see below), whose sum is σ = 313051024. Its totient is φ = 311955300.

The previous prime is 312503137. The next prime is 312503173. The reversal of 312503161 is 161305213.

It is a happy number.

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: 161305213 = 1493 ⋅108041.

It is a cyclic number.

It is not a de Polignac number, because 312503161 - 2¹⁵ = 312470393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312503761) 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, 273075 + ... + 274216.

It is an arithmetic number, because the mean of its divisors is an integer number (78262756).

Almost surely, 2^312503161 is an apocalyptic number.

It is an amenable number.

312503161 is a deficient number, since it is larger than the sum of its proper divisors (547863).

312503161 is an equidigital number, since it uses as much as digits as its factorization.

312503161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547862.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 312503161 is about 17677.7589360190. The cubic root of 312503161 is about 678.6066922141.

Adding to 312503161 its reverse (161305213), we get a palindrome (473808374).

The spelling of 312503161 in words is "three hundred twelve million, five hundred three thousand, one hundred sixty-one".