216133537 has 2 divisors, whose sum is σ = 216133538. Its totient is φ = 216133536.

The previous prime is 216133487. The next prime is 216133633. The reversal of 216133537 is 735331612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165096801 + 51036736 = 12849^2 + 7144^2 .

It is a cyclic number.

It is not a de Polignac number, because 216133537 - 2⁷ = 216133409 is a prime.

It is a super-2 number, since 2×216133537² = 93427411632260738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216133499 and 216133508.

It is not a weakly prime, because it can be changed into another prime (216131537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108066768 + 108066769.

It is an arithmetic number, because the mean of its divisors is an integer number (108066769).

Almost surely, 2^216133537 is an apocalyptic number.

It is an amenable number.

216133537 is a deficient number, since it is larger than the sum of its proper divisors (1).

216133537 is an equidigital number, since it uses as much as digits as its factorization.

216133537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The square root of 216133537 is about 14701.4807757586. The cubic root of 216133537 is about 600.1236198988.

The spelling of 216133537 in words is "two hundred sixteen million, one hundred thirty-three thousand, five hundred thirty-seven".