155830997 has 4 divisors (see below), whose sum is σ = 178092576. Its totient is φ = 133569420.

The previous prime is 155830973. The next prime is 155831023. The reversal of 155830997 is 799038551.

155830997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 799038551 = 163 ⋅4902077.

It is a cyclic number.

It is not a de Polignac number, because 155830997 - 2⁶ = 155830933 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 (155830907) 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, 11130779 + ... + 11130792.

It is an arithmetic number, because the mean of its divisors is an integer number (44523144).

Almost surely, 2^155830997 is an apocalyptic number.

It is an amenable number.

155830997 is a deficient number, since it is larger than the sum of its proper divisors (22261579).

155830997 is an equidigital number, since it uses as much as digits as its factorization.

155830997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22261578.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 155830997 is about 12483.2286288444. The cubic root of 155830997 is about 538.1267937267.

The spelling of 155830997 in words is "one hundred fifty-five million, eight hundred thirty thousand, nine hundred ninety-seven".