149647681 has 2 divisors, whose sum is σ = 149647682. Its totient is φ = 149647680.

The previous prime is 149647669. The next prime is 149647691. The reversal of 149647681 is 186746941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 13808656 = 11655^2 + 3716^2 .

It is a cyclic number.

It is not a de Polignac number, because 149647681 - 2¹³ = 149639489 is a prime.

It is a super-2 number, since 2×149647681² = 44788856857355522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149647601) 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, 74823840 + 74823841.

It is an arithmetic number, because the mean of its divisors is an integer number (74823841).

Almost surely, 2^149647681 is an apocalyptic number.

It is an amenable number.

149647681 is a deficient number, since it is larger than the sum of its proper divisors (1).

149647681 is an equidigital number, since it uses as much as digits as its factorization.

149647681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 149647681 is about 12233.0568951509. The cubic root of 149647681 is about 530.9129642437.

The spelling of 149647681 in words is "one hundred forty-nine million, six hundred forty-seven thousand, six hundred eighty-one".