151781047 has 4 divisors (see below), whose sum is σ = 165579336. Its totient is φ = 137982760.

The previous prime is 151781033. The next prime is 151781051. The reversal of 151781047 is 740187151.

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 151781047 - 2²⁷ = 17563319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151781027) 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, 6899128 + ... + 6899149.

It is an arithmetic number, because the mean of its divisors is an integer number (41394834).

Almost surely, 2^151781047 is an apocalyptic number.

151781047 is a deficient number, since it is larger than the sum of its proper divisors (13798289).

151781047 is a wasteful number, since it uses less digits than its factorization.

151781047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13798288.

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 151781047 is about 12319.9450891633. The cubic root of 151781047 is about 533.4239546099.

The spelling of 151781047 in words is "one hundred fifty-one million, seven hundred eighty-one thousand, forty-seven".