149397681 has 16 divisors (see below), whose sum is σ = 201412800. Its totient is φ = 98496960.

The previous prime is 149397659. The next prime is 149397697. The reversal of 149397681 is 186793941.

It is a happy number.

It is not a de Polignac number, because 149397681 - 2¹⁸ = 149135537 is a prime.

It is a super-2 number, since 2×149397681² = 44639334176355522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 149397681.

It is not an unprimeable number, because it can be changed into a prime (149397881) 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 in 15 ways as a sum of consecutive naturals, for example, 125911 + ... + 127091.

It is an arithmetic number, because the mean of its divisors is an integer number (12588300).

Almost surely, 2^149397681 is an apocalyptic number.

It is an amenable number.

149397681 is a deficient number, since it is larger than the sum of its proper divisors (52015119).

149397681 is a wasteful number, since it uses less digits than its factorization.

149397681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 326592, while the sum is 48.

The square root of 149397681 is about 12222.8344094158. The cubic root of 149397681 is about 530.6171533979.

The spelling of 149397681 in words is "one hundred forty-nine million, three hundred ninety-seven thousand, six hundred eighty-one".