151312321 has 2 divisors, whose sum is σ = 151312322. Its totient is φ = 151312320.

The previous prime is 151312319. The next prime is 151312349. The reversal of 151312321 is 123213151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119049921 + 32262400 = 10911^2 + 5680^2 .

It is an emirp because it is prime and its reverse (123213151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151312321 - 2¹ = 151312319 is a prime.

It is a super-3 number, since 3×151312321³ (a number of 26 digits) contains 333 as substring.

Together with 151312319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (151312621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75656160 + 75656161.

It is an arithmetic number, because the mean of its divisors is an integer number (75656161).

Almost surely, 2^151312321 is an apocalyptic number.

It is an amenable number.

151312321 is a deficient number, since it is larger than the sum of its proper divisors (1).

151312321 is an equidigital number, since it uses as much as digits as its factorization.

151312321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 151312321 is about 12300.9073242586. The cubic root of 151312321 is about 532.8742867337.

Adding to 151312321 its reverse (123213151), we get a palindrome (274525472).

The spelling of 151312321 in words is "one hundred fifty-one million, three hundred twelve thousand, three hundred twenty-one".