155122001531 has 4 divisors (see below), whose sum is σ = 177282287472. Its totient is φ = 132961715592.

The previous prime is 155122001513. The next prime is 155122001569. The reversal of 155122001531 is 135100221551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155122001531 - 2¹⁴ = 155121985147 is a prime.

It is a super-2 number, since 2×155122001531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155122001531.

It is not an unprimeable number, because it can be changed into a prime (155122001831) 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, 11080142960 + ... + 11080142973.

It is an arithmetic number, because the mean of its divisors is an integer number (44320571868).

Almost surely, 2^155122001531 is an apocalyptic number.

155122001531 is a deficient number, since it is larger than the sum of its proper divisors (22160285941).

155122001531 is an equidigital number, since it uses as much as digits as its factorization.

155122001531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22160285940.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 155122001531 in words is "one hundred fifty-five billion, one hundred twenty-two million, one thousand, five hundred thirty-one".