84737509 has 2 divisors, whose sum is σ = 84737510. Its totient is φ = 84737508.

The previous prime is 84737491. The next prime is 84737519. The reversal of 84737509 is 90573748.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76615009 + 8122500 = 8753^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 84737509 - 2²³ = 76348901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84737519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42368754 + 42368755.

It is an arithmetic number, because the mean of its divisors is an integer number (42368755).

Almost surely, 2^84737509 is an apocalyptic number.

It is an amenable number.

84737509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84737509 is an equidigital number, since it uses as much as digits as its factorization.

84737509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 84737509 is about 9205.2978767664. The cubic root of 84737509 is about 439.2299012188.

The spelling of 84737509 in words is "eighty-four million, seven hundred thirty-seven thousand, five hundred nine".