53691247 has 2 divisors, whose sum is σ = 53691248. Its totient is φ = 53691246.

The previous prime is 53691233. The next prime is 53691277. The reversal of 53691247 is 74219635.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53691247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53691217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26845623 + 26845624.

It is an arithmetic number, because the mean of its divisors is an integer number (26845624).

Almost surely, 2^53691247 is an apocalyptic number.

53691247 is a deficient number, since it is larger than the sum of its proper divisors (1).

53691247 is an equidigital number, since it uses as much as digits as its factorization.

53691247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 53691247 is about 7327.4311323956. The cubic root of 53691247 is about 377.2545591079.

The spelling of 53691247 in words is "fifty-three million, six hundred ninety-one thousand, two hundred forty-seven".