51213497 has 2 divisors, whose sum is σ = 51213498. Its totient is φ = 51213496.

The previous prime is 51213451. The next prime is 51213509. The reversal of 51213497 is 79431215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40819321 + 10394176 = 6389^2 + 3224^2 .

It is a cyclic number.

It is not a de Polignac number, because 51213497 - 2¹² = 51209401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51213427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606748 + 25606749.

It is an arithmetic number, because the mean of its divisors is an integer number (25606749).

Almost surely, 2^51213497 is an apocalyptic number.

It is an amenable number.

51213497 is a deficient number, since it is larger than the sum of its proper divisors (1).

51213497 is an equidigital number, since it uses as much as digits as its factorization.

51213497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 51213497 is about 7156.3605973987. The cubic root of 51213497 is about 371.3597327413.

The spelling of 51213497 in words is "fifty-one million, two hundred thirteen thousand, four hundred ninety-seven".