155928997 has 4 divisors (see below), whose sum is σ = 178204576. Its totient is φ = 133653420.

The previous prime is 155928931. The next prime is 155929001. The reversal of 155928997 is 799829551.

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, and also an emirpimes, since its reverse is a distinct semiprime: 799829551 = 263 ⋅3041177.

It is a cyclic number.

It is not a de Polignac number, because 155928997 - 2¹⁵ = 155896229 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 (155923997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11137779 + ... + 11137792.

It is an arithmetic number, because the mean of its divisors is an integer number (44551144).

Almost surely, 2^155928997 is an apocalyptic number.

It is an amenable number.

155928997 is a deficient number, since it is larger than the sum of its proper divisors (22275579).

155928997 is an equidigital number, since it uses as much as digits as its factorization.

155928997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22275578.

The product of its digits is 2041200, while the sum is 55.

The square root of 155928997 is about 12487.1532784698. The cubic root of 155928997 is about 538.2395769674.

The spelling of 155928997 in words is "one hundred fifty-five million, nine hundred twenty-eight thousand, nine hundred ninety-seven".