51611207 has 2 divisors, whose sum is σ = 51611208. Its totient is φ = 51611206.

The previous prime is 51611177. The next prime is 51611221. The reversal of 51611207 is 70211615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51611207 - 2¹⁸ = 51349063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51611237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25805603 + 25805604.

It is an arithmetic number, because the mean of its divisors is an integer number (25805604).

Almost surely, 2^51611207 is an apocalyptic number.

51611207 is a deficient number, since it is larger than the sum of its proper divisors (1).

51611207 is an equidigital number, since it uses as much as digits as its factorization.

51611207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 51611207 is about 7184.0940277811. The cubic root of 51611207 is about 372.3185477228.

The spelling of 51611207 in words is "fifty-one million, six hundred eleven thousand, two hundred seven".