155151749 has 4 divisors (see below), whose sum is σ = 158935980. Its totient is φ = 151367520.

The previous prime is 155151719. The next prime is 155151761. The reversal of 155151749 is 947151551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67354849 + 87796900 = 8207^2 + 9370^2 .

It is a cyclic number.

It is not a de Polignac number, because 155151749 - 2¹⁶ = 155086213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155151719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892054 + ... + 1892135.

It is an arithmetic number, because the mean of its divisors is an integer number (39733995).

Almost surely, 2^155151749 is an apocalyptic number.

It is an amenable number.

155151749 is a deficient number, since it is larger than the sum of its proper divisors (3784231).

155151749 is an equidigital number, since it uses as much as digits as its factorization.

155151749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784230.

The product of its digits is 31500, while the sum is 38.

The square root of 155151749 is about 12455.9924935751. The cubic root of 155151749 is about 537.3437789372.

The spelling of 155151749 in words is "one hundred fifty-five million, one hundred fifty-one thousand, seven hundred forty-nine".