149724257 has 4 divisors (see below), whose sum is σ = 149749440. Its totient is φ = 149699076.

The previous prime is 149724247. The next prime is 149724269. The reversal of 149724257 is 752427941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752427941 = 41 ⋅18351901.

It is a cyclic number.

It is not a de Polignac number, because 149724257 - 2⁶ = 149724193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149724247) 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 3 ways as a sum of consecutive naturals, for example, 1844 + ... + 17402.

It is an arithmetic number, because the mean of its divisors is an integer number (37437360).

Almost surely, 2^149724257 is an apocalyptic number.

It is an amenable number.

149724257 is a deficient number, since it is larger than the sum of its proper divisors (25183).

149724257 is an equidigital number, since it uses as much as digits as its factorization.

149724257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25182.

The product of its digits is 141120, while the sum is 41.

The square root of 149724257 is about 12236.1863748474. The cubic root of 149724257 is about 531.0035063719.

The spelling of 149724257 in words is "one hundred forty-nine million, seven hundred twenty-four thousand, two hundred fifty-seven".