149681261 has 2 divisors, whose sum is σ = 149681262. Its totient is φ = 149681260.

The previous prime is 149681239. The next prime is 149681291. The reversal of 149681261 is 162186941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127825636 + 21855625 = 11306^2 + 4675^2 .

It is a cyclic number.

It is not a de Polignac number, because 149681261 - 2⁶ = 149681197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149681291) 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, 74840630 + 74840631.

It is an arithmetic number, because the mean of its divisors is an integer number (74840631).

Almost surely, 2^149681261 is an apocalyptic number.

It is an amenable number.

149681261 is a deficient number, since it is larger than the sum of its proper divisors (1).

149681261 is an equidigital number, since it uses as much as digits as its factorization.

149681261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 149681261 is about 12234.4293287427. The cubic root of 149681261 is about 530.9526724523.

The spelling of 149681261 in words is "one hundred forty-nine million, six hundred eighty-one thousand, two hundred sixty-one".