151985917 has 2 divisors, whose sum is σ = 151985918. Its totient is φ = 151985916.

The previous prime is 151985887. The next prime is 151985957. The reversal of 151985917 is 719589151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150332121 + 1653796 = 12261^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 151985917 - 2⁷ = 151985789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151985957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75992958 + 75992959.

It is an arithmetic number, because the mean of its divisors is an integer number (75992959).

Almost surely, 2^151985917 is an apocalyptic number.

It is an amenable number.

151985917 is a deficient number, since it is larger than the sum of its proper divisors (1).

151985917 is an equidigital number, since it uses as much as digits as its factorization.

151985917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 46.

The square root of 151985917 is about 12328.2568516397. The cubic root of 151985917 is about 533.6638471737.

It can be divided in two parts, 15198 and 5917, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 151985917 in words is "one hundred fifty-one million, nine hundred eighty-five thousand, nine hundred seventeen".