149551 has 2 divisors, whose sum is σ = 149552. Its totient is φ = 149550.

The previous prime is 149543. The next prime is 149561. The reversal of 149551 is 155941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149551 - 2³ = 149543 is a prime.

149551 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74775 + 74776.

It is an arithmetic number, because the mean of its divisors is an integer number (74776).

2¹⁴⁹⁵⁵¹ is an apocalyptic number.

149551 is a deficient number, since it is larger than the sum of its proper divisors (1).

149551 is an equidigital number, since it uses as much as digits as its factorization.

149551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 149551 is about 386.7182436865. The cubic root of 149551 is about 53.0798606187.

It can be divided in two parts, 1495 and 51, that multiplied together give a triangular number (76245 = T₃₉₀).

The spelling of 149551 in words is "one hundred forty-nine thousand, five hundred fifty-one".