155194989 has 16 divisors (see below), whose sum is σ = 219360960. Its totient is φ = 97260800.

The previous prime is 155194939. The next prime is 155194993. The reversal of 155194989 is 989491551.

It is a cyclic number.

It is not a de Polignac number, because 155194989 - 2⁸ = 155194733 is a prime.

It is a super-2 number, since 2×155194989² = 48170969221420242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155194939) 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 15 ways as a sum of consecutive naturals, for example, 65182 + ... + 67520.

It is an arithmetic number, because the mean of its divisors is an integer number (13710060).

Almost surely, 2^155194989 is an apocalyptic number.

It is an amenable number.

155194989 is a deficient number, since it is larger than the sum of its proper divisors (64165971).

155194989 is a wasteful number, since it uses less digits than its factorization.

155194989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its digits is 583200, while the sum is 51.

The square root of 155194989 is about 12457.7280834027. The cubic root of 155194989 is about 537.3936926228.

The spelling of 155194989 in words is "one hundred fifty-five million, one hundred ninety-four thousand, nine hundred eighty-nine".