51211577 has 2 divisors, whose sum is σ = 51211578. Its totient is φ = 51211576.

The previous prime is 51211571. The next prime is 51211603. The reversal of 51211577 is 77511215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 929296 = 7091^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 51211577 - 2²² = 47017273 is a prime.

It is not a weakly prime, because it can be changed into another prime (51211571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605788 + 25605789.

It is an arithmetic number, because the mean of its divisors is an integer number (25605789).

Almost surely, 2^51211577 is an apocalyptic number.

It is an amenable number.

51211577 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211577 is an equidigital number, since it uses as much as digits as its factorization.

51211577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2450, while the sum is 29.

The square root of 51211577 is about 7156.2264497429. The cubic root of 51211577 is about 371.3550919100.

The spelling of 51211577 in words is "fifty-one million, two hundred eleven thousand, five hundred seventy-seven".