155124911881 has 3 divisors (see below), whose sum is σ = 155125305741. Its totient is φ = 155124518022.

The previous prime is 155124911867. The next prime is 155124911941. The reversal of 155124911881 is 188119421551.

The square root of 155124911881 is 393859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 155124911881 - 2¹¹ = 155124909833 is a prime.

It is a super-2 number, since 2×155124911881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155124911831) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 196930 + ... + 590788.

It is an arithmetic number, because the mean of its divisors is an integer number (51708435247).

Almost surely, 2^155124911881 is an apocalyptic number.

155124911881 is the 393859-th square number.

155124911881 is the 196930-th centered octagonal number.

It is an amenable number.

155124911881 is a deficient number, since it is larger than the sum of its proper divisors (393860).

155124911881 is an frugal number, since it uses more digits than its factorization.

155124911881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787718 (or 393859 counting only the distinct ones).

The product of its digits is 115200, while the sum is 46.

The spelling of 155124911881 in words is "one hundred fifty-five billion, one hundred twenty-four million, nine hundred eleven thousand, eight hundred eighty-one".