149781457 has 8 divisors (see below), whose sum is σ = 171291456. Its totient is φ = 128299632.

The previous prime is 149781449. The next prime is 149781479. The reversal of 149781457 is 754187941.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149781457 - 2³ = 149781449 is a prime.

It is a super-2 number, since 2×149781457² = 44868969722085698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (149781757) 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 in 7 ways as a sum of consecutive naturals, for example, 5958 + ... + 18304.

It is an arithmetic number, because the mean of its divisors is an integer number (21411432).

Almost surely, 2^149781457 is an apocalyptic number.

It is an amenable number.

149781457 is a deficient number, since it is larger than the sum of its proper divisors (21509999).

149781457 is a wasteful number, since it uses less digits than its factorization.

149781457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14087.

The product of its digits is 282240, while the sum is 46.

The square root of 149781457 is about 12238.5234812047. The cubic root of 149781457 is about 531.0711185146.

The spelling of 149781457 in words is "one hundred forty-nine million, seven hundred eighty-one thousand, four hundred fifty-seven".