151231331 has 2 divisors, whose sum is σ = 151231332. Its totient is φ = 151231330.

The previous prime is 151231309. The next prime is 151231351. The reversal of 151231331 is 133132151.

It is an a-pointer prime, because the next prime (151231351) can be obtained adding 151231331 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151231331 is a prime.

It is a super-2 number, since 2×151231331² = 45741830952063122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (151231351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75615665 + 75615666.

It is an arithmetic number, because the mean of its divisors is an integer number (75615666).

Almost surely, 2^151231331 is an apocalyptic number.

151231331 is a deficient number, since it is larger than the sum of its proper divisors (1).

151231331 is an equidigital number, since it uses as much as digits as its factorization.

151231331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 20.

The square root of 151231331 is about 12297.6148500431. The cubic root of 151231331 is about 532.7791960178.

Adding to 151231331 its reverse (133132151), we get a palindrome (284363482).

The spelling of 151231331 in words is "one hundred fifty-one million, two hundred thirty-one thousand, three hundred thirty-one".