312021253 has 2 divisors, whose sum is σ = 312021254. Its totient is φ = 312021252.

The previous prime is 312021239. The next prime is 312021263. The reversal of 312021253 is 352120213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264452644 + 47568609 = 16262^2 + 6897^2 .

It is an emirp because it is prime and its reverse (352120213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312021253 - 2²¹ = 309924101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312021253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312021263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010626 + 156010627.

It is an arithmetic number, because the mean of its divisors is an integer number (156010627).

Almost surely, 2^312021253 is an apocalyptic number.

It is an amenable number.

312021253 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021253 is an equidigital number, since it uses as much as digits as its factorization.

312021253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 312021253 is about 17664.1233295061. The cubic root of 312021253 is about 678.2576885559.

Adding to 312021253 its reverse (352120213), we get a palindrome (664141466).

The spelling of 312021253 in words is "three hundred twelve million, twenty-one thousand, two hundred fifty-three".