155320751 has 4 divisors (see below), whose sum is σ = 159109104. Its totient is φ = 151532400.

The previous prime is 155320747. The next prime is 155320799. The reversal of 155320751 is 157023551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157023551 = 8999 ⋅17449.

It is a cyclic number.

It is not a de Polignac number, because 155320751 - 2² = 155320747 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 (155320351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894115 + ... + 1894196.

It is an arithmetic number, because the mean of its divisors is an integer number (39777276).

Almost surely, 2^155320751 is an apocalyptic number.

155320751 is a deficient number, since it is larger than the sum of its proper divisors (3788353).

155320751 is an equidigital number, since it uses as much as digits as its factorization.

155320751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788352.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 155320751 is about 12462.7746108160. The cubic root of 155320751 is about 537.5388121244.

The spelling of 155320751 in words is "one hundred fifty-five million, three hundred twenty thousand, seven hundred fifty-one".