155043899 has 4 divisors (see below), whose sum is σ = 157006560. Its totient is φ = 153081240.

The previous prime is 155043881. The next prime is 155043901. The reversal of 155043899 is 998340551.

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: 998340551 = 13 ⋅76795427.

It is a cyclic number.

It is not a de Polignac number, because 155043899 - 2⁸ = 155043643 is a prime.

It is a super-2 number, since 2×155043899² = 48077221234244402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155013899) 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, 981212 + ... + 981369.

It is an arithmetic number, because the mean of its divisors is an integer number (39251640).

Almost surely, 2^155043899 is an apocalyptic number.

155043899 is a deficient number, since it is larger than the sum of its proper divisors (1962661).

155043899 is an equidigital number, since it uses as much as digits as its factorization.

155043899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962660.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 155043899 is about 12451.6624994416. The cubic root of 155043899 is about 537.2192428830.

The spelling of 155043899 in words is "one hundred fifty-five million, forty-three thousand, eight hundred ninety-nine".