65198531 has 2 divisors, whose sum is σ = 65198532. Its totient is φ = 65198530.

The previous prime is 65198513. The next prime is 65198561. The reversal of 65198531 is 13589156.

Together with previous prime (65198513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65198531 is a prime.

It is a super-2 number, since 2×65198531² = 8501696889115922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (65198501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32599265 + 32599266.

It is an arithmetic number, because the mean of its divisors is an integer number (32599266).

Almost surely, 2^65198531 is an apocalyptic number.

65198531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65198531 is an equidigital number, since it uses as much as digits as its factorization.

65198531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 65198531 is about 8074.5607310862. The cubic root of 65198531 is about 402.4815129814.

The spelling of 65198531 in words is "sixty-five million, one hundred ninety-eight thousand, five hundred thirty-one".