102309731 has 2 divisors, whose sum is σ = 102309732. Its totient is φ = 102309730.

The previous prime is 102309677. The next prime is 102309761. The reversal of 102309731 is 137903201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102309731 is a prime.

It is a super-2 number, since 2×102309731² = 20934562114584722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102309731.

It is not a weakly prime, because it can be changed into another prime (102309761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51154865 + 51154866.

It is an arithmetic number, because the mean of its divisors is an integer number (51154866).

Almost surely, 2^102309731 is an apocalyptic number.

102309731 is a deficient number, since it is larger than the sum of its proper divisors (1).

102309731 is an equidigital number, since it uses as much as digits as its factorization.

102309731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 102309731 is about 10114.8272847340. The cubic root of 102309731 is about 467.7053247000.

The spelling of 102309731 in words is "one hundred two million, three hundred nine thousand, seven hundred thirty-one".