151631281 has 2 divisors, whose sum is σ = 151631282. Its totient is φ = 151631280.

The previous prime is 151631237. The next prime is 151631297. The reversal of 151631281 is 182136151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 22240656 = 11375^2 + 4716^2 .

It is an emirp because it is prime and its reverse (182136151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151631281 - 2¹⁹ = 151106993 is a prime.

It is a super-2 number, since 2×151631281² = 45984090755401922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (151631231) 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, 75815640 + 75815641.

It is an arithmetic number, because the mean of its divisors is an integer number (75815641).

Almost surely, 2^151631281 is an apocalyptic number.

It is an amenable number.

151631281 is a deficient number, since it is larger than the sum of its proper divisors (1).

151631281 is an equidigital number, since it uses as much as digits as its factorization.

151631281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 151631281 is about 12313.8653963733. The cubic root of 151631281 is about 533.2484494683.

The spelling of 151631281 in words is "one hundred fifty-one million, six hundred thirty-one thousand, two hundred eighty-one".