155991534 has 16 divisors (see below), whose sum is σ = 312107472. Its totient is φ = 51976448.

The previous prime is 155991533. The next prime is 155991553. The reversal of 155991534 is 435199551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155991533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22462 + ... + 28574.

It is an arithmetic number, because the mean of its divisors is an integer number (19506717).

Almost surely, 2^155991534 is an apocalyptic number.

155991534 is an abundant number, since it is smaller than the sum of its proper divisors (156115938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155991534 is a wasteful number, since it uses less digits than its factorization.

155991534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371.

The product of its digits is 121500, while the sum is 42.

The square root of 155991534 is about 12489.6570809610. The cubic root of 155991534 is about 538.3115229390.

The spelling of 155991534 in words is "one hundred fifty-five million, nine hundred ninety-one thousand, five hundred thirty-four".