191047251 has 16 divisors (see below), whose sum is σ = 260409600. Its totient is φ = 124547808.

The previous prime is 191047231. The next prime is 191047267. The reversal of 191047251 is 152740191.

191047251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191047251 - 2¹¹ = 191045203 is a prime.

It is a super-2 number, since 2×191047251² = 72998104229314002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191047211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32130 + ... + 37608.

It is an arithmetic number, because the mean of its divisors is an integer number (16275600).

Almost surely, 2^191047251 is an apocalyptic number.

191047251 is a deficient number, since it is larger than the sum of its proper divisors (69362349).

191047251 is a wasteful number, since it uses less digits than its factorization.

191047251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5738.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 191047251 is about 13821.9843365560. The cubic root of 191047251 is about 575.9440079880.

The spelling of 191047251 in words is "one hundred ninety-one million, forty-seven thousand, two hundred fifty-one".