155628899 has 2 divisors, whose sum is σ = 155628900. Its totient is φ = 155628898.

The previous prime is 155628881. The next prime is 155628937. The reversal of 155628899 is 998826551.

155628899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155628899 - 2¹² = 155624803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155628899.

It is not a weakly prime, because it can be changed into another prime (155628199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77814449 + 77814450.

It is an arithmetic number, because the mean of its divisors is an integer number (77814450).

Almost surely, 2^155628899 is an apocalyptic number.

155628899 is a deficient number, since it is larger than the sum of its proper divisors (1).

155628899 is an equidigital number, since it uses as much as digits as its factorization.

155628899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 53.

The square root of 155628899 is about 12475.1312217547. The cubic root of 155628899 is about 537.8940599757.

The spelling of 155628899 in words is "one hundred fifty-five million, six hundred twenty-eight thousand, eight hundred ninety-nine".