151863881 has 4 divisors (see below), whose sum is σ = 163545732. Its totient is φ = 140182032.

The previous prime is 151863863. The next prime is 151863883. The reversal of 151863881 is 188368151.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82973881 + 68890000 = 9109^2 + 8300^2 .

It is a cyclic number.

It is not a de Polignac number, because 151863881 - 2¹⁰ = 151862857 is a prime.

It is a super-2 number, since 2×151863881² = 46125276704764322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151863883) 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, 5840906 + ... + 5840931.

It is an arithmetic number, because the mean of its divisors is an integer number (40886433).

Almost surely, 2^151863881 is an apocalyptic number.

It is an amenable number.

151863881 is a deficient number, since it is larger than the sum of its proper divisors (11681851).

151863881 is a wasteful number, since it uses less digits than its factorization.

151863881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11681850.

The product of its digits is 46080, while the sum is 41.

The square root of 151863881 is about 12323.3064150820. The cubic root of 151863881 is about 533.5209750770.

The spelling of 151863881 in words is "one hundred fifty-one million, eight hundred sixty-three thousand, eight hundred eighty-one".