155119921 has 4 divisors (see below), whose sum is σ = 169221744. Its totient is φ = 141018100.

The previous prime is 155119919. The next prime is 155119949. The reversal of 155119921 is 129911551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155119921 - 2¹ = 155119919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155119961) 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, 7050895 + ... + 7050916.

It is an arithmetic number, because the mean of its divisors is an integer number (42305436).

Almost surely, 2^155119921 is an apocalyptic number.

155119921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155119921 is a deficient number, since it is larger than the sum of its proper divisors (14101823).

155119921 is a wasteful number, since it uses less digits than its factorization.

155119921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14101822.

The product of its digits is 4050, while the sum is 34.

The square root of 155119921 is about 12454.7148100629. The cubic root of 155119921 is about 537.3070326602.

The spelling of 155119921 in words is "one hundred fifty-five million, one hundred nineteen thousand, nine hundred twenty-one".