47145391 has 2 divisors, whose sum is σ = 47145392. Its totient is φ = 47145390.

The previous prime is 47145361. The next prime is 47145401. The reversal of 47145391 is 19354174.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47145391 - 2⁵ = 47145359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47145311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23572695 + 23572696.

It is an arithmetic number, because the mean of its divisors is an integer number (23572696).

Almost surely, 2^47145391 is an apocalyptic number.

47145391 is a deficient number, since it is larger than the sum of its proper divisors (1).

47145391 is an equidigital number, since it uses as much as digits as its factorization.

47145391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 47145391 is about 6866.2501410887. The cubic root of 47145391 is about 361.2543461201.

The spelling of 47145391 in words is "forty-seven million, one hundred forty-five thousand, three hundred ninety-one".