149645257 has 2 divisors, whose sum is σ = 149645258. Its totient is φ = 149645256.

The previous prime is 149645219. The next prime is 149645263. The reversal of 149645257 is 752546941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141229456 + 8415801 = 11884^2 + 2901^2 .

It is a cyclic number.

It is not a de Polignac number, because 149645257 - 2²³ = 141256649 is a prime.

It is a super-3 number, since 3×149645257³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (149645207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74822628 + 74822629.

It is an arithmetic number, because the mean of its divisors is an integer number (74822629).

Almost surely, 2^149645257 is an apocalyptic number.

It is an amenable number.

149645257 is a deficient number, since it is larger than the sum of its proper divisors (1).

149645257 is an equidigital number, since it uses as much as digits as its factorization.

149645257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The square root of 149645257 is about 12232.9578189414. The cubic root of 149645257 is about 530.9100976440.

The spelling of 149645257 in words is "one hundred forty-nine million, six hundred forty-five thousand, two hundred fifty-seven".