51484991 has 2 divisors, whose sum is σ = 51484992. Its totient is φ = 51484990.

The previous prime is 51484957. The next prime is 51484997. The reversal of 51484991 is 19948415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51484991 - 2²² = 47290687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51484997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25742495 + 25742496.

It is an arithmetic number, because the mean of its divisors is an integer number (25742496).

Almost surely, 2^51484991 is an apocalyptic number.

51484991 is a deficient number, since it is larger than the sum of its proper divisors (1).

51484991 is an equidigital number, since it uses as much as digits as its factorization.

51484991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 51484991 is about 7175.3042444206. The cubic root of 51484991 is about 372.0147964015.

The spelling of 51484991 in words is "fifty-one million, four hundred eighty-four thousand, nine hundred ninety-one".