51156181 has 2 divisors, whose sum is σ = 51156182. Its totient is φ = 51156180.

The previous prime is 51156167. The next prime is 51156241. The reversal of 51156181 is 18165115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35593156 + 15563025 = 5966^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 51156181 - 2¹³ = 51147989 is a prime.

It is a super-2 number, since 2×51156181² = 5233909709009522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51156121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25578090 + 25578091.

It is an arithmetic number, because the mean of its divisors is an integer number (25578091).

Almost surely, 2^51156181 is an apocalyptic number.

It is an amenable number.

51156181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51156181 is an equidigital number, since it uses as much as digits as its factorization.

51156181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 28.

The square root of 51156181 is about 7152.3549268755. The cubic root of 51156181 is about 371.2211442767.

The spelling of 51156181 in words is "fifty-one million, one hundred fifty-six thousand, one hundred eighty-one".