149840557 has 2 divisors, whose sum is σ = 149840558. Its totient is φ = 149840556.

The previous prime is 149840549. The next prime is 149840563. The reversal of 149840557 is 755048941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78960996 + 70879561 = 8886^2 + 8419^2 .

It is a cyclic number.

It is not a de Polignac number, because 149840557 - 2³ = 149840549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149840357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74920278 + 74920279.

It is an arithmetic number, because the mean of its divisors is an integer number (74920279).

Almost surely, 2^149840557 is an apocalyptic number.

It is an amenable number.

149840557 is a deficient number, since it is larger than the sum of its proper divisors (1).

149840557 is an equidigital number, since it uses as much as digits as its factorization.

149840557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 149840557 is about 12240.9377500255. The cubic root of 149840557 is about 531.1409584368.

The spelling of 149840557 in words is "one hundred forty-nine million, eight hundred forty thousand, five hundred fifty-seven".