155913397 has 8 divisors (see below), whose sum is σ = 157791960. Its totient is φ = 154041600.

The previous prime is 155913391. The next prime is 155913421. The reversal of 155913397 is 793319551.

It can be written as a sum of positive squares in 4 ways, for example, as 86007076 + 69906321 = 9274^2 + 8361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155913397 - 2⁷ = 155913269 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 (155913391) 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 7 ways as a sum of consecutive naturals, for example, 56113 + ... + 58825.

It is an arithmetic number, because the mean of its divisors is an integer number (19723995).

Almost surely, 2^155913397 is an apocalyptic number.

It is an amenable number.

155913397 is a deficient number, since it is larger than the sum of its proper divisors (1878563).

155913397 is a wasteful number, since it uses less digits than its factorization.

155913397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383.

The product of its digits is 127575, while the sum is 43.

The square root of 155913397 is about 12486.5286208778. The cubic root of 155913397 is about 538.2216268799.

The spelling of 155913397 in words is "one hundred fifty-five million, nine hundred thirteen thousand, three hundred ninety-seven".