947257251 has 4 divisors (see below), whose sum is σ = 1263009672. Its totient is φ = 631504832.

The previous prime is 947257249. The next prime is 947257273. The reversal of 947257251 is 152752749.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152752749 = 3 ⋅50917583.

It is a cyclic number.

It is not a de Polignac number, because 947257251 - 2¹ = 947257249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (947257651) 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, 157876206 + ... + 157876211.

It is an arithmetic number, because the mean of its divisors is an integer number (315752418).

Almost surely, 2^947257251 is an apocalyptic number.

947257251 is a deficient number, since it is larger than the sum of its proper divisors (315752421).

947257251 is a wasteful number, since it uses less digits than its factorization.

947257251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315752420.

The product of its digits is 176400, while the sum is 42.

The square root of 947257251 is about 30777.5445901716. The cubic root of 947257251 is about 982.1006069814.

The spelling of 947257251 in words is "nine hundred forty-seven million, two hundred fifty-seven thousand, two hundred fifty-one".