51471661 has 2 divisors, whose sum is σ = 51471662. Its totient is φ = 51471660.

The previous prime is 51471649. The next prime is 51471671. The reversal of 51471661 is 16617415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46498761 + 4972900 = 6819^2 + 2230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51471661 is a prime.

It is a super-3 number, since 3×51471661³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51471671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25735830 + 25735831.

It is an arithmetic number, because the mean of its divisors is an integer number (25735831).

Almost surely, 2^51471661 is an apocalyptic number.

It is an amenable number.

51471661 is a deficient number, since it is larger than the sum of its proper divisors (1).

51471661 is an equidigital number, since it uses as much as digits as its factorization.

51471661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 51471661 is about 7174.3753038157. The cubic root of 51471661 is about 371.9826874627.

The spelling of 51471661 in words is "fifty-one million, four hundred seventy-one thousand, six hundred sixty-one".