155021351 has 4 divisors (see below), whose sum is σ = 164140272. Its totient is φ = 145902432.

The previous prime is 155021303. The next prime is 155021381. The reversal of 155021351 is 153120551.

It is a happy number.

155021351 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 a de Polignac number, because none of the positive numbers 2^k-155021351 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 (155021381) 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, 4559435 + ... + 4559468.

It is an arithmetic number, because the mean of its divisors is an integer number (41035068).

Almost surely, 2^155021351 is an apocalyptic number.

155021351 is a deficient number, since it is larger than the sum of its proper divisors (9118921).

155021351 is an equidigital number, since it uses as much as digits as its factorization.

155021351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9118920.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155021351 is about 12450.7570452563. The cubic root of 155021351 is about 537.1931990619.

The spelling of 155021351 in words is "one hundred fifty-five million, twenty-one thousand, three hundred fifty-one".