149681657 has 2 divisors, whose sum is σ = 149681658. Its totient is φ = 149681656.

The previous prime is 149681647. The next prime is 149681681. The reversal of 149681657 is 756186941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88153321 + 61528336 = 9389^2 + 7844^2 .

It is a cyclic number.

It is not a de Polignac number, because 149681657 - 2¹⁶ = 149616121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149681647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74840828 + 74840829.

It is an arithmetic number, because the mean of its divisors is an integer number (74840829).

Almost surely, 2^149681657 is an apocalyptic number.

It is an amenable number.

149681657 is a deficient number, since it is larger than the sum of its proper divisors (1).

149681657 is an equidigital number, since it uses as much as digits as its factorization.

149681657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 149681657 is about 12234.4455125682. The cubic root of 149681657 is about 530.9531406852.

The spelling of 149681657 in words is "one hundred forty-nine million, six hundred eighty-one thousand, six hundred fifty-seven".