155640351 has 4 divisors (see below), whose sum is σ = 207520472. Its totient is φ = 103760232.

The previous prime is 155640347. The next prime is 155640391. The reversal of 155640351 is 153046551.

155640351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 155640351 - 2² = 155640347 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 (155640301) 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, 25940056 + ... + 25940061.

It is an arithmetic number, because the mean of its divisors is an integer number (51880118).

Almost surely, 2^155640351 is an apocalyptic number.

155640351 is a deficient number, since it is larger than the sum of its proper divisors (51880121).

155640351 is an equidigital number, since it uses as much as digits as its factorization.

155640351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51880120.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 155640351 is about 12475.5902064792. The cubic root of 155640351 is about 537.9072533516.

The spelling of 155640351 in words is "one hundred fifty-five million, six hundred forty thousand, three hundred fifty-one".