151943681 has 4 divisors (see below), whose sum is σ = 158549952. Its totient is φ = 145337412.

The previous prime is 151943657. The next prime is 151943683. The reversal of 151943681 is 186349151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186349151 = 23 ⋅8102137.

It is a cyclic number.

It is not a de Polignac number, because 151943681 - 2¹⁰ = 151942657 is a prime.

It is a super-2 number, since 2×151943681² = 46173764391659522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151943683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3303101 + ... + 3303146.

It is an arithmetic number, because the mean of its divisors is an integer number (39637488).

Almost surely, 2^151943681 is an apocalyptic number.

It is an amenable number.

151943681 is a deficient number, since it is larger than the sum of its proper divisors (6606271).

151943681 is an equidigital number, since it uses as much as digits as its factorization.

151943681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606270.

The product of its digits is 25920, while the sum is 38.

The square root of 151943681 is about 12326.5437572744. The cubic root of 151943681 is about 533.6144085702.

The spelling of 151943681 in words is "one hundred fifty-one million, nine hundred forty-three thousand, six hundred eighty-one".