149232781 has 2 divisors, whose sum is σ = 149232782. Its totient is φ = 149232780.

The previous prime is 149232773. The next prime is 149232823. The reversal of 149232781 is 187232941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 29877156 = 10925^2 + 5466^2 .

It is a cyclic number.

It is not a de Polignac number, because 149232781 - 2³ = 149232773 is a prime.

It is a super-2 number, since 2×149232781² = 44540845849987922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 149232781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149232761) 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, 74616390 + 74616391.

It is an arithmetic number, because the mean of its divisors is an integer number (74616391).

Almost surely, 2^149232781 is an apocalyptic number.

It is an amenable number.

149232781 is a deficient number, since it is larger than the sum of its proper divisors (1).

149232781 is an equidigital number, since it uses as much as digits as its factorization.

149232781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 149232781 is about 12216.0869757873. The cubic root of 149232781 is about 530.4218558974.

The spelling of 149232781 in words is "one hundred forty-nine million, two hundred thirty-two thousand, seven hundred eighty-one".